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Document And Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Jan. 31, 2012	Jun. 30, 2011
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec 31, 2011
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2011
Trading Symbol	XOM
Entity Registrant Name	EXXON MOBIL CORP
Entity Central Index Key	0000034088
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		4,713,220,567
Entity Public Float			$ 395

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Consolidated Statement Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues and other income
Sales and other operating revenue	$ 467,029	[1],[2]	$ 370,125	[1],[2]	$ 301,500	[1],[2]
Income from equity affiliates	15,289		10,677		7,143
Other income	4,111		2,419		1,943
Total revenues and other income	486,429		383,221		310,586
Costs and other deductions
Crude oil and product purchases	266,534		197,959		152,806
Production and manufacturing expenses	40,268		35,792		33,027
Selling, general and administrative expenses	14,983		14,683		14,735
Depreciation and depletion	15,583		14,760		11,917
Exploration expenses, including dry holes	2,081		2,144		2,021
Interest expense	247		259		548
Sales-based taxes	33,503	[2]	28,547	[2]	25,936	[2]
Other taxes and duties	39,973		36,118		34,819
Total costs and other deductions	413,172		330,262		275,809
Income before income taxes	73,257		52,959		34,777
Income taxes	31,051		21,561		15,119
Net income including noncontrolling interests	42,206		31,398		19,658
Net income attributable to noncontrolling interests	1,146		938		378
Net income attributable to ExxonMobil	$ 41,060		$ 30,460		$ 19,280
Earnings per common share (dollars)	$ 8.43		$ 6.24		$ 3.99
Earnings per common share - assuming dilution (dollars)	$ 8.42		$ 6.22		$ 3.98
[1]	Sales and other operating revenue includes sales-based taxes of $33,503 million for 2011, $28,547 million for 2010 and $25,936 million for 2009. See Note 1, Summary of Accounting Policies.
[2]	Sales and other operating revenue includes sales-based taxes of $33,503 million for 2011, $28,547 million for 2010 and $25,936 million for 2009.

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Consolidated Statement Of Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Income [Abstract]
Sales and other operating revenue, sales-based taxes	$ 33,503	[1]	$ 28,547	[1]	$ 25,936	[1]
[1]	Sales and other operating revenue includes sales-based taxes of $33,503 million for 2011, $28,547 million for 2010 and $25,936 million for 2009.

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Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 12,664	$ 7,825
Cash and cash equivalents - restricted	404	628
Notes and accounts receivable, less estimated doubtful amounts	38,642	32,284
Inventories
Crude oil, products and merchandise	11,665	9,852
Materials and supplies	3,359	3,124
Other current assets	6,229	5,271
Total current assets	72,963	58,984
Investments, advances and long-term receivables	34,333	35,338
Property, plant and equipment, at cost, less accumulated depreciation and depletion	214,664	199,548
Other assets, including intangibles, net	9,092	8,640
Total assets	331,052	302,510
Current liabilities
Notes and loans payable	7,711	2,787
Accounts payable and accrued liabilities	57,067	50,034
Income taxes payable	12,727	9,812
Total current liabilities	77,505	62,633
Long-term debt	9,322	12,227
Postretirement benefits reserves	24,994	19,367
Deferred income tax liabilities	36,618	35,150
Other long-term obligations	21,869	20,454
Total liabilities	170,308	149,831
Commitments and contingencies
Equity
Common stock without par value (9,000 million shares authorized, 8,019 million shares issued)	9,512	9,371
Earnings reinvested	330,939	298,899
Accumulated other comprehensive income
Cumulative foreign exchange translation adjustment	4,168	5,011
Postretirement benefits reserves adjustment	(13,291)	(9,889)
Unrealized gain on cash flow hedges		55
Common stock held in treasury (3,285 million shares in 2011 and 3,040 million shares in 2010)	(176,932)	(156,608)
ExxonMobil share of equity	154,396	146,839
Noncontrolling interests	6,348	5,840
Total equity	160,744	152,679
Total liabilities and equity	$ 331,052	$ 302,510

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Consolidated Balance Sheet (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheet [Abstract]
Common stock, without par value
Common stock, shares authorized	9,000,000,000	9,000,000,000
Common stock, shares issued	8,019,000,000	8,019,000,000
Common stock held in treasury, shares	3,285,000,000	3,040,000,000

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Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities
Net income including noncontrolling interests	$ 42,206	$ 31,398	$ 19,658
Adjustments for noncash transactions
Depreciation and depletion	15,583	14,760	11,917
Deferred income tax charges/(credits)	142	(1,135)
Postretirement benefits expense in excess of/(less than) net payments	544	1,700	(1,722)
Other long-term obligation provisions in excess of/(less than) payments	(151)	160	731
Dividends received greater than/(less than) equity in current earnings of equity companies	(273)	(596)	(483)
Changes in operational working capital, excluding cash and debt
Reduction/(increase) - Notes and accounts receivable	(7,906)	(5,863)	(3,170)
- Inventories	(2,208)	(1,148)	459
- Other current assets	222	913	132
Increase/(reduction) - Accounts and other payables	8,880	9,943	1,420
Net (gain) on asset sales	(2,842)	(1,401)	(488)
All other items - net	1,148	(318)	(16)
Net cash provided by operating activities	55,345	48,413	28,438
Cash flows from investing activities
Additions to property, plant and equipment	(30,975)	(26,871)	(22,491)
Proceeds associated with sales of subsidiaries, property, plant and equipment, and sales and returns of investments	11,133	3,261	1,545
Decrease/(increase) in restricted cash and cash equivalents	224	(628)
Additional investments and advances	(3,586)	(1,239)	(2,752)
Collection of advances	1,119	1,133	724
Additions to marketable securities	(1,754)	(15)	(16)
Sales of marketable securities	1,674	155	571
Net cash used in investing activities	(22,165)	(24,204)	(22,419)
Cash flows from financing activities
Additions to long-term debt	702	1,143	225
Reductions in long-term debt	(266)	(6,224)	(68)
Additions to short-term debt	1,063	598	1,336
Reductions in short-term debt	(1,103)	(2,436)	(1,575)
Additions/(reductions) in debt with three months or less maturity	1,561	709	(71)
Cash dividends to ExxonMobil shareholders	(9,020)	(8,498)	(8,023)
Cash dividends to noncontrolling interests	(306)	(281)	(280)
Changes in noncontrolling interests	(16)	(7)	(113)
Tax benefits related to stock-based awards	260	122	237
Common stock acquired	(22,055)	(13,093)	(19,703)
Common stock sold	924	1,043	752
Net cash used in financing activities	(28,256)	(26,924)	(27,283)
Effects of exchange rate changes on cash	(85)	(153)	520
Increase/(decrease) in cash and cash equivalents	4,839	(2,868)	(20,744)
Cash and cash equivalents at beginning of year	7,825	10,693	31,437
Cash and cash equivalents at end of year	$ 12,664	$ 7,825	$ 10,693

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Consolidated Statement Of Cash Flows (Parenthetical) (USD $) In Millions, unless otherwise specified	Dec. 31, 2010	Jun. 25, 2010
Consolidated Statement Of Cash Flows [Abstract]
Value of XTO Energy Inc. equity acquired	$ 24,659	$ 24,659

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Consolidated Statement Of Changes In Equity (USD $) In Millions	Common Stock [Member] USD ($)	Earnings Reinvested [Member] USD ($)	Accumulated Other Comprehensive Income [Member] USD ($)	Common Stock Held In Treasury [Member] USD ($)	Exxon Mobil Share Of Equity [Member] USD ($)	Noncontrolling Interests [Member] USD ($)	Outstanding [Member]	Total USD ($)
Balance at Dec. 31, 2008	$ 5,314	$ 265,680	$ (9,931)	$ (148,098)	$ 112,965	$ 4,558		$ 117,523
Balance (in shares) at Dec. 31, 2008	8,019			(3,043)			4,976
Amortization of stock-based awards	685				685			685
Tax benefits related to stock-based awards	140				140			140
Other	(636)				(636)			(636)
Net income for the year		19,280			19,280	378		19,658
Dividends - common shares		(8,023)			(8,023)	(280)		(8,303)
Foreign exchange translation adjustment			3,256		3,256	373		3,629
Postretirement benefits reserves adjustment (Note 16)			(196)		(196)	(144)		(340)
Amortization of postretirement benefits reserves adjustment included in net periodic benefit costs (Note 16)			1,410		1,410	51		1,461
Acquisitions, at cost				(19,703)	(19,703)	(127)		(19,830)
Dispositions				1,391	1,391	14		1,405
Acquisitions (in shares)				(277)			(277)
Dispositions (in shares)				28			28
Balance at Dec. 31, 2009	5,503	276,937	(5,461)	(166,410)	110,569	4,823		115,392
Balance (in shares) at Dec. 31, 2009	8,019			(3,292)			4,727
Amortization of stock-based awards	751				751			751
Tax benefits related to stock-based awards	280				280			280
Other	(683)				(683)	10		(673)
Net income for the year		30,460			30,460	938		31,398
Dividends - common shares		(8,498)			(8,498)	(281)		(8,779)
Foreign exchange translation adjustment			584		584	450		1,034
Adjustment for foreign exchange translation loss included in net income			25		25			25
Postretirement benefits reserves adjustment (Note 16)			(1,014)		(1,014)	(147)		(1,161)
Amortization of postretirement benefits reserves adjustment included in net periodic benefit costs (Note 16)			988		988	52		1,040
Change in fair value of cash flow hedges			184		184			184
Realized (gain)/loss from settled cash flow hedges included in net income			(129)		(129)			(129)
Acquisitions, at cost				(13,093)	(13,093)	(5)		(13,098)
Issued for XTO merger	3,520			21,139	24,659			24,659
Dispositions				1,756	1,756			1,756
Acquisitions (in shares)				(199)			(199)
Issued for XTO merger (in shares)				416			416
Dispositions (in shares)				35			35
Balance at Dec. 31, 2010	9,371	298,899	(4,823)	(156,608)	146,839	5,840		152,679
Balance (in shares) at Dec. 31, 2010	8,019			(3,040)			4,979
Amortization of stock-based awards	742				742			742
Tax benefits related to stock-based awards	202				202			202
Other	(803)				(803)	(5)		(808)
Net income for the year		41,060			41,060	1,146		42,206
Dividends - common shares		(9,020)			(9,020)	(306)		(9,326)
Foreign exchange translation adjustment			(843)		(843)	(24)		(867)
Postretirement benefits reserves adjustment (Note 16)			(4,557)		(4,557)	(350)		(4,907)
Amortization of postretirement benefits reserves adjustment included in net periodic benefit costs (Note 16)			1,155		1,155	62		1,217
Change in fair value of cash flow hedges			28		28			28
Realized (gain)/loss from settled cash flow hedges included in net income			(83)		(83)			(83)
Acquisitions, at cost				(22,055)	(22,055)	(15)		(22,070)
Dispositions				1,731	1,731			1,731
Acquisitions (in shares)				(278)			(278)
Dispositions (in shares)				33			33
Balance at Dec. 31, 2011	$ 9,512	$ 330,939	$ (9,123)	$ (176,932)	$ 154,396	$ 6,348		$ 160,744
Balance (in shares) at Dec. 31, 2011	8,019			(3,285)			4,734

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Consolidated Statement Of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 42,206	$ 31,398	$ 19,658
Other comprehensive income (net of income taxes)
Foreign exchange translation adjustment	(867)	1,034	3,629
Adjustment for foreign exchange translation loss included in net income		25
Postretirement benefits reserves adjustment (excluding amortization)	(4,907)	(1,161)	(340)
Amortization of postretirement benefits reserves adjustment included in net periodic benefit costs	1,217	1,040	1,461
Change in fair value of cash flow hedges	28	184
Realized (gain)/loss from settled cash flow hedges included in net income	(83)	(129)
Comprehensive income including noncontrolling interests	37,594	32,391	24,408
Comprehensive income attributable to noncontrolling interests	834	1,293	658
Comprehensive income attributable to ExxonMobil	$ 36,760	$ 31,098	$ 23,750

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Summary Of Accounting Policies	12 Months Ended
Dec. 31, 2011
Summary Of Accounting Policies [Abstract]
Summary Of Accounting Policies	1. Summary of Accounting Policies Principles of Consolidation. The Consolidated Financial Statements include the accounts of subsidiaries the Corporation controls. They also include the Corporation's share of the undivided interest in certain upstream assets and liabilities. Amounts representing the Corporation's percentage interest in the underlying net assets of entities that it does not control, but over which it exercises significant influence, are included in "Investments, advances and long-term receivables". The Corporation's share of the net income of these companies is included in the Consolidated Statement of Income caption "Income from equity affiliates." Majority ownership is normally the indicator of control that is the basis on which subsidiaries are consolidated. However, certain factors may indicate that a majority-owned investment is not controlled and therefore should be accounted for using the equity method of accounting. These factors occur where the minority shareholders are granted by law or by contract substantive participating rights. These include the right to approve operating policies, expense budgets, financing and investment plans, and management compensation and succession plans. The Corporation's share of the cumulative foreign exchange translation adjustment for equity method investments is reported in the Consolidated Statement of Changes in Equity. Evidence of loss in value that might indicate impairment of investments in companies accounted for on the equity method is assessed to determine if such evidence represents a loss in value of the Corporation's investment that is other than temporary. Examples of key indicators include a history of operating losses, a negative earnings and cash flow outlook, significant downward revisions to oil and gas reserves, and the financial condition and prospects for the investee's business segment or geographic region. If evidence of an other than temporary loss in fair value below carrying amount is determined, an impairment is recognized. In the absence of market prices for the investment, discounted cash flows are used to assess fair value.   Revenue Recognition. The Corporation generally sells crude oil, natural gas and petroleum and chemical products under short-term agreements at prevailing market prices. In some cases (e.g., natural gas), products may be sold under long-term agreements, with periodic price adjustments. Revenues are recognized when the products are delivered, which occurs when the customer has taken title and has assumed the risks and rewards of ownership, prices are fixed or determinable and collectibility is reasonably assured. Revenues from the production of natural gas properties in which the Corporation has an interest with other producers are recognized on the basis of the Corporation's net working interest. Differences between actual production and net working interest volumes are not significant. Purchases and sales of inventory with the same counterparty that are entered into in contemplation of one another are combined and recorded as exchanges measured at the book value of the item sold.   Sales-Based Taxes. The Corporation reports sales, excise and value-added taxes on sales transactions on a gross basis in the Consolidated Statement of Income (included in both revenues and costs). Derivative Instruments. The Corporation makes limited use of derivative instruments. The Corporation does not engage in speculative derivative activities or derivative trading activities, nor does it use derivatives with leveraged features. When the Corporation does enter into derivative transactions, it is to offset exposures associated with interest rates, foreign currency exchange rates and hydrocarbon prices that arise from existing assets, liabilities and forecasted transactions. The gains and losses resulting from changes in the fair value of derivatives are recorded in income. In some cases, the Corporation designates derivatives as fair value hedges, in which case the gains and losses are offset in income by the gains and losses arising from changes in the fair value of the underlying hedged item. Fair Value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Hierarchy Levels 1, 2 and 3 are terms for the priority of inputs to valuation techniques used to measure fair value. Hierarchy Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Hierarchy Level 2 inputs are inputs other than quoted prices included within Level 1 that are directly or indirectly observable for the asset or liability. Hierarchy Level 3 inputs are inputs that are not observable in the market.   Inventories. Crude oil, products and merchandise inventories are carried at the lower of current market value or cost (generally determined under the last-in, first-out method – LIFO). Inventory costs include expenditures and other charges (including depreciation) directly and indirectly incurred in bringing the inventory to its existing condition and location. Selling expenses and general and administrative expenses are reported as period costs and excluded from inventory cost. Inventories of materials and supplies are valued at cost or less. Property, Plant and Equipment. Depreciation, depletion and amortization, based on cost less estimated salvage value of the asset, are primarily determined under either the unit-of-production method or the straight-line method, which is based on estimated asset service life taking obsolescence into consideration. Maintenance and repairs, including planned major maintenance, are expensed as incurred. Major renewals and improvements are capitalized and the assets replaced are retired. Interest costs incurred to finance expenditures during the construction phase of multiyear projects are capitalized as part of the historical cost of acquiring the constructed assets. The project construction phase commences with the development of the detailed engineering design and ends when the constructed assets are ready for their intended use. Capitalized interest costs are included in property, plant and equipment and are depreciated over the service life of the related assets. The Corporation uses the "successful efforts" method to account for its exploration and production activities. Under this method, costs are accumulated on a field-by-field basis with certain exploratory expenditures and exploratory dry holes being expensed as incurred. Costs of productive wells and development dry holes are capitalized and amortized on the unit-of-production method. The Corporation carries as an asset exploratory well costs when the well has found a sufficient quantity of reserves to justify its completion as a producing well and where the Corporation is making sufficient progress assessing the reserves and the economic and operating viability of the project. Exploratory well costs not meeting these criteria are charged to expense. Other exploratory expenditures, including geophysical costs and annual lease rentals, are expensed as incurred. Acquisition costs of proved properties are amortized using a unit-of-production method, computed on the basis of total proved oil and gas reserves. Capitalized exploratory drilling and development costs associated with productive depletable extractive properties are amortized using unit-of-production rates based on the amount of proved developed reserves of oil, gas and other minerals that are estimated to be recoverable from existing facilities using current operating methods. Under the unit-of-production method, oil and gas volumes are considered produced once they have been measured through meters at custody transfer or sales transaction points at the outlet valve on the lease or field storage tank. Production costs are expensed as incurred. Production involves lifting the oil and gas to the surface and gathering, treating, field processing and field storage of the oil and gas. The production function normally terminates at the outlet valve on the lease or field production storage tank. Production costs are those incurred to operate and maintain the Corporation's wells and related equipment and facilities. They become part of the cost of oil and gas produced. These costs, sometimes referred to as lifting costs, include such items as labor costs to operate the wells and related equipment; repair and maintenance costs on the wells and equipment; materials, supplies and energy costs required to operate the wells and related equipment; and administrative expenses related to the production activity. Proved oil and gas properties held and used by the Corporation are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amounts may not be recoverable. Assets are grouped at the lowest level for which there are identifiable cash flows that are largely independent of the cash flows of other groups of assets. The Corporation estimates the future undiscounted cash flows of the affected properties to judge the recoverability of carrying amounts. Cash flows used in impairment evaluations are developed using annually updated corporate plan investment evaluation assumptions for crude oil commodity prices and foreign currency exchange rates. Annual volumes are based on field production profiles, which are also updated annually. Prices for natural gas and other products are based on corporate plan assumptions developed annually by major region and also for investment evaluation purposes. Cash flow estimates for impairment testing exclude derivative instruments. Impairment analyses are generally based on proved reserves. Where probable reserves exist, an appropriately risk-adjusted amount of these reserves may be included in the impairment evaluation. Impairments are measured by the amount the carrying value exceeds the fair value. Significant unproved properties are assessed for impairment individually, and valuation allowances against the capitalized costs are recorded based on the estimated economic chance of success and the length of time that the Corporation expects to hold the properties. Properties that are not individually significant are aggregated by groups and amortized based on development risk and average holding period. The valuation allowances are reviewed at least annually. Gains on sales of proved and unproved properties are only recognized when there is no uncertainty about the recovery of costs applicable to any interest retained or where there is no substantial obligation for future performance by the Corporation. Losses on properties sold are recognized when incurred or when the properties are held for sale and the fair value of the properties is less than the carrying value.   Asset Retirement Obligations and Environmental Liabilities. The Corporation incurs retirement obligations for certain assets at the time they are installed. The fair values of these obligations are recorded as liabilities on a discounted basis. The costs associated with these liabilities are capitalized as part of the related assets and depreciated. Over time, the liabilities are accreted for the change in their present value. Liabilities for environmental costs are recorded when it is probable that obligations have been incurred and the amounts can be reasonably estimated. These liabilities are not reduced by possible recoveries from third parties and projected cash expenditures are not discounted. Foreign Currency Translation. The Corporation selects the functional reporting currency for its international subsidiaries based on the currency of the primary economic environment in which each subsidiary operates. Downstream and Chemical operations primarily use the local currency. However, the U.S. dollar is used in countries with a history of high inflation (primarily in Latin America) and Singapore, which predominantly sells into the U.S. dollar export market. Upstream operations which are relatively self-contained and integrated within a particular country, such as Canada, the United Kingdom, Norway and continental Europe, use the local currency. Some Upstream operations, primarily in Asia and Africa, use the U.S. dollar because they predominantly sell crude and natural gas production into U.S. dollar-denominated markets. For all operations, gains or losses from remeasuring foreign currency transactions into the functional currency are included in income.  Stock-Based Payments. The Corporation awards stock-based compensation to employees in the form of restricted stock and restricted stock units. Compensation expense is measured by the market price of the restricted shares at the date of grant and is recognized in the income statement over the requisite service period of each award. See Note 14, Incentive Program, for further details.

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Accounting Changes	12 Months Ended
Dec. 31, 2011
Accounting Changes [Abstract]
Accounting Changes	2. Accounting Changes The Corporation did not adopt authoritative guidance in 2011 that had a material impact on the Corporation's financial statements.

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Miscellaneous Financial Information	12 Months Ended
Dec. 31, 2011
Miscellaneous Financial Information [Abstract]
Miscellaneous Financial Information	3. Miscellaneous Financial Information Research and development costs totaled $1,044 million in 2011, $1,012 million in 2010 and $1,050 million in 2009. Net income included before-tax aggregate foreign exchange transaction losses of $184 million and $251 million, and gains of $54 million in 2011, 2010 and 2009, respectively. In 2011, 2010 and 2009, net income included gains of $292 million, $317 million and $207 million, respectively, attributable to the combined effects of LIFO inventory accumulations and draw-downs. The aggregate replacement cost of inventories was estimated to exceed their LIFO carrying values by $25.6 billion and $21.3 billion at December 31, 2011, and 2010, respectively. Crude oil, products and merchandise as of year-end 2011 and 2010 consist of the following:        2011        2010       (billions of dollars)   Petroleum products   $ 4.1         $ 3.5    Crude oil     4.8           3.8    Chemical products     2.3           2.1    Gas/other     0.5           0.5    Total   $ 11.7         $ 9.9

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Cash Flow Information	12 Months Ended
Dec. 31, 2011
Cash Flow Information [Abstract]
Cash Flow Information	4. Cash Flow Information The Consolidated Statement of Cash Flows provides information about changes in cash and cash equivalents. Highly liquid investments with maturities of three months or less when acquired are classified as cash equivalents. The "Net (gain) on asset sales" in net cash provided by operating activities on the Consolidated Statement of Cash Flows includes before-tax gains from the sale of some Upstream Canadian, U.K. and other producing properties and assets, and the sale of U.S. service stations in 2011; from the sale of some Upstream Gulf of Mexico and other producing properties, the sale of U.S. service stations and other Downstream assets and investments and the formation of a Chemical joint venture in 2010; and from the sale of Downstream assets and investments and producing properties in the Upstream in 2009. These gains are reported in "Other income" on the Consolidated Statement of Income. Included in "Proceeds associated with sales of subsidiaries, property, plant, and equipment, and sales and returns of investments" in 2011 is a $3.6 billion deposit for a potential asset sale.        2011        2010        2009       (millions of dollars)   Cash payments for interest   $ 557         $ 703         $ 820    Cash payments for income taxes   $ 27,254         $ 18,941         $ 15,427

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Additional Working Capital Information	12 Months Ended
Dec. 31, 2011
Additional Working Capital Information [Abstract]
Additional Working Capital Information	5. Additional Working Capital Information        Dec. 31 2011        Dec. 31 2010       (millions of dollars)   Notes and accounts receivable        Trade, less reserves of $128 million and $152 million   $ 30,044         $ 25,439    Other, less reserves of $39 million and $34 million     8,598           6,845    Total   $ 38,642         $ 32,284    Notes and loans payable        Bank loans   $ 1,237         $ 532    Commercial paper     2,281           1,346    Long-term debt due within one year     3,431           345    Other     762           564    Total   $ 7,711         $ 2,787    Accounts payable and accrued liabilities        Trade payables   $ 33,969         $ 30,780    Payables to equity companies     5,553           5,450    Accrued taxes other than income taxes     7,123           6,778    Other     10,422           7,026    Total   $ 57,067         $ 50,034    On December 31, 2011, unused credit lines for short-term financing totaled approximately $5.5 billion. Of this total, $2.8 billion support commercial paper programs under terms negotiated when drawn. The weighted-average interest rate on short-term borrowings outstanding at December 31, 2011, and 2010, was 1.9 percent and 1.2 percent, respectively.

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Equity Company Information	12 Months Ended
Dec. 31, 2011
Equity Company Information [Abstract]
Equity Company Information	6. Equity Company Information The summarized financial information below includes amounts related to certain less-than-majority-owned companies and majority-owned subsidiaries where minority shareholders possess the right to participate in significant management decisions (see Note 1). These companies are primarily engaged in crude production, natural gas marketing and refining operations in North America; natural gas production, natural gas distribution and downstream operations in Europe; crude production in Kazakhstan; and liquefied natural gas (LNG) operations in Qatar. Also included are several power generation, refining, petrochemical manufacturing and chemical ventures. The Corporation's ownership in these ventures is in the form of shares in corporate joint ventures as well as interests in partnerships. The share of total equity company revenues from sales to ExxonMobil consolidated companies was 19 percent, 18 percent and 19 percent in the years 2011, 2010 and 2009, respectively.        2011      2010      2009   Equity Company Financial Summary    Total      ExxonMobil Share      Total      ExxonMobil Share      Total      ExxonMobil Share        (millions of dollars)   Total revenues    $ 204,635       $ 65,147       $ 153,020       $ 48,355       $ 112,153       $ 36,570    Income before income taxes    $ 68,908       $ 20,892       $ 48,075       $ 14,735       $ 28,472       $ 9,632    Income taxes      19,812         5,603         13,962         4,058         7,775         2,489    Income from equity affiliates    $ 49,096       $ 15,289       $ 34,113       $ 10,677       $ 20,697       $ 7,143                      Current assets    $ 52,879       $ 17,317       $ 48,573       $ 15,860       $ 37,376       $ 12,843    Long-term assets      96,908         30,833         90,646         29,805         88,153         27,983    Total assets    $ 149,787       $ 48,150       $ 139,219       $ 45,665       $ 125,529       $ 40,826    Current liabilities    $ 41,016       $ 12,454       $ 33,160       $ 10,260       $ 24,854       $ 8,085    Long-term liabilities      62,472         18,728         59,596         17,976         57,384         16,999    Net assets    $ 46,299       $ 16,968       $ 46,463       $ 17,429       $ 43,291       $ 15,742        A list of significant equity companies as of December 31, 2011, together with the Corporation's percentage ownership interest, is detailed below:          Percentage Ownership Interest   Upstream   Aera Energy LLC     48    BEB Erdgas und Erdoel GmbH     50    Cameroon Oil Transportation Company S.A.     41    Castle Peak Power Company Limited     60    Golden Pass LNG Terminal LLC     18    Nederlandse Aardolie Maatschappij B.V.     50    Qatar Liquefied Gas Company Limited     10    Qatar Liquefied Gas Company Limited 2     24    Ras Laffan Liquefied Natural Gas Company Limited     25    Ras Laffan Liquefied Natural Gas Company Limited II     31    Ras Laffan Liquefied Natural Gas Company Limited (3)     30    South Hook LNG Terminal Company Limited     24    Tengizchevroil, LLP     25    Terminale GNL Adriatico S.r.l.     71    Downstream   Chalmette Refining, LLC     50    Fujian Refining & Petrochemical Co. Ltd.     25    Saudi Aramco Mobil Refinery Company Ltd.     50    Chemical   Al-Jubail Petrochemical Company     50    Infineum Holdings B.V.     50    Saudi Yanbu Petrochemical Co.     50    Toray Tonen Specialty Separator Godo Kaisha     50

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Investments, Advances And Long-Term Receivables	12 Months Ended
Dec. 31, 2011
Investments, Advances And Long-Term Receivables [Abstract]
Investments, Advances And Long-Term Receivables	7. Investments, Advances and Long-Term Receivables           Dec. 31, 2011        Dec. 31, 2010          (millions of dollars)   Companies carried at equity in underlying assets           Investments      $ 16,968         $ 17,429    Advances        9,740           9,286    Total equity company investments and advances      $ 26,708         $ 26,715    Companies carried at cost or less and stock investments carried at fair value        1,544           1,557    Long-term receivables and miscellaneous investments at cost or less, net of reserves of $469 million and $292 million        6,081           7,066    Total      $ 34,333         $ 35,338

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Property, Plant And Equipment And Asset Retirement Obligations	12 Months Ended
Dec. 31, 2011
Property, Plant And Equipment And Asset Retirement Obligations [Abstract]
Property, Plant And Equipment And Asset Retirement Obligations	8. Property, Plant and Equipment and Asset Retirement Obligations       Dec. 31, 2011        Dec. 31, 2010   Property, Plant and Equipment   Cost        Net        Cost        Net       (millions of dollars)   Upstream   $ 283,710         $ 163,975         $ 264,136         $ 148,152    Downstream     67,900           28,801           68,652           30,095    Chemical     30,405           14,469           29,524           14,255    Other     11,980           7,419           11,626           7,046    Total   $ 393,995         $ 214,664         $ 373,938         $ 199,548      In the Upstream segment, depreciation is generally on a unit-of-production basis, so depreciable life will vary by field. In the Downstream segment, investments in refinery and lubes basestock manufacturing facilities are generally depreciated on a straight-line basis over a 25-year life and service station buildings and fixed improvements over a 20-year life. In the Chemical segment, investments in process equipment are generally depreciated on a straight-line basis over a 20-year life. Accumulated depreciation and depletion totaled $179,331 million at the end of 2011 and $174,390 million at the end of 2010. Interest capitalized in 2011, 2010 and 2009 was $593 million, $532 million and $425 million, respectively.   Asset Retirement Obligations The Corporation incurs retirement obligations for its upstream assets. The fair values of these obligations are recorded as liabilities on a discounted basis, which is typically at the time the assets are installed. The Corporation uses estimates, assumptions and judgments regarding such factors as the existence of a legal obligation for an asset retirement obligation; technical assessments of the assets; estimated amounts and timing of settlements; discount rates; and inflation rates. Asset retirement obligations incurred in the current period were Level 3 (unobservable inputs) fair value measurements. The costs associated with these liabilities are capitalized as part of the related assets and depreciated as the reserves are produced. Over time, the liabilities are accreted for the change in their present value. Asset retirement obligations for downstream and chemical facilities generally become firm at the time the facilities are permanently shut down and dismantled. These obligations may include the costs of asset disposal and additional soil remediation. However, these sites have indeterminate lives based on plans for continued operations and as such, the fair value of the conditional legal obligations cannot be measured, since it is impossible to estimate the future settlement dates of such obligations. The following table summarizes the activity in the liability for asset retirement obligations:        2011      2010       (millions of dollars)   Beginning balance   $ 9,614       $ 8,473    Accretion expense and other provisions     581         563    Reduction due to property sales     (854 )       (183 )  Payments made     (662 )       (638 )  Liabilities incurred     117         1,094    Foreign currency translation     (62 )       (45 )  Revisions     1,844         350    Ending balance   $ 10,578       $ 9,614

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Accounting For Suspended Exploratory Well Costs	12 Months Ended
Dec. 31, 2011
Accounting For Suspended Exploratory Well Costs [Abstract]
Accounting For Suspended Exploratory Well Costs	9. Accounting for Suspended Exploratory Well Costs The Corporation continues capitalization of exploratory well costs beyond one year after the well is completed if (a) the well found a sufficient quantity of reserves to justify its completion as a producing well and (b) sufficient progress is being made in assessing the reserves and the economic and operating viability of the project. The following two tables provide details of the changes in the balance of suspended exploratory well costs as well as an aging summary of those costs. Change in capitalized suspended exploratory well costs:        2011      2010      2009       (millions of dollars)   Balance beginning at January 1   $ 2,893       $ 2,005       $ 1,585    Additions pending the determination of proved reserves     310         1,103         624    Charged to expense     (213 )       (104 )       (51 )  Reclassifications to wells, facilities and equipment based on the determination of proved reserves     (149 )       (136 )       (200 )  Other     40         25         47    Ending balance   $ 2,881       $ 2,893       $ 2,005    Ending balance attributed to equity companies included above   $ –       $ –       $ 9    Period end capitalized suspended exploratory well costs:        2011        2010        2009       (millions of dollars)   Capitalized for a period of one year or less   $ 310         $ 1,103         $ 624    Capitalized for a period of between one and five years     1,922           1,294           924    Capitalized for a period of between five and ten years     409           278           220    Capitalized for a period of greater than ten years     240           218           237    Capitalized for a period greater than one year – subtotal   $ 2,571         $ 1,790         $ 1,381    Total   $ 2,881         $ 2,893         $ 2,005    Exploration activity often involves drilling multiple wells, over a number of years, to fully evaluate a project. The table below provides a numerical breakdown of the number of projects with suspended exploratory well costs which had their first capitalized well drilled in the preceding 12 months and those that have had exploratory well costs capitalized for a period greater than 12 months.        2011        2010        2009   Number of projects with first capitalized well drilled in the preceding 12 months              4                    9                 18    Number of projects that have exploratory well costs capitalized for a period of greater than 12 months            58                  59                 57    Total            62                  68                 75        Of the 58 projects that have exploratory well costs capitalized for a period greater than 12 months as of December 31, 2011, 26 projects have drilling in the preceding 12 months or exploratory activity planned in the next two years, while the remaining 32 projects are those with completed exploratory activity progressing toward development. The table below provides additional detail for those 32 projects, which total $1,133 million.   Country/Project   Dec. 31, 2011     Years Wells Drilled   Comment                              (millions of dollars)      Angola                 – Perpetua-Zina-Acacia   $ 15      2008 - 2009   Oil field near Pazflor development, awaiting capacity in existing/planned infrastructure. Australia                 – East Pilchard     10      2001   Gas field near Kipper/Tuna development, awaiting capacity in existing/planned infrastructure. – SE Longtom     15      2010   Gas field near Tuna development, awaiting capacity in existing/planned infrastructure. Indonesia                 – Natuna     118      1981 - 1983   Development activity under way, while continuing discussions with the government on contract terms pursuant to executed Heads of Agreement. Kazakhstan                 – Kairan     53      2004 - 2007   Declarations involving field commerciality filed with Kazakhstan government in 2008; progressing commercialization and field development studies. Malaysia                 – Besar     18      1992 - 2010   Gas field off the east coast of Malaysia; progressing development plan. – Other (2 projects)     8      1979 - 1995   Projects primarily awaiting capacity in existing or planned infrastructure. Nigeria                 – Bolia     15      2002 - 2006   Evaluating development plan, while continuing discussions with the government regarding regional hub strategy. – Bosi     79      2002 - 2006   Development activity under way, while continuing discussions with the government regarding development plan. – Pegi     32      2009   Awaiting capacity in existing/planned infrastructure – Other (4 projects)     13      2002   Pursuing development of several additional offshore satellite discoveries which will tie back to existing/planned production facilities. Norway                 – Gamma     20      2008 - 2009   Evaluating development plan for tieback to existing production facilities. – H-North     15      2007   Discovery near existing facilities in Fram area; progressing development plans. – Lavrans     22      1995 - 1999   Development awaiting capacity in existing Kristin production facility; evaluating development concepts for phased ullage scenarios. – Nyk High     19      2008   Evaluating field development alternatives. – Other (6 projects)     26      1992 - 2010   Evaluating development plans, including potential for tieback to existing production facilities. Papua New Guinea                 – Juha     28      2007   Working on development plans to tie into planned LNG facilities. United Kingdom                 – Fram     55      2009   Progressing development and commercialization plans. – Other (2 projects)     14      2001 - 2004   Projects primarily awaiting capacity in existing or planned infrastructure. United States                 – Julia Unit     78      2007 - 2008   Reached agreement with the Department of Interior and Department of Justice providing for suspension of production; progressing development plans with partners. – Point Thomson     449      1977 - 2010   Continuing discussions with government and partners on development plan. – Tip Top     31      2009   Evaluating development concept and requisite facility upgrades. Total 2011 (32 projects)   $ 1,133

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Leased Facilities	12 Months Ended
Dec. 31, 2011
Leased Facilities [Abstract]
Leased Facilities	10. Leased Facilities At December 31, 2011, the Corporation and its consolidated subsidiaries held noncancelable operating charters and leases covering drilling equipment, tankers, service stations and other properties with minimum undiscounted lease commitments totaling $7,914 million as indicated in the table. Estimated related rental income from noncancelable subleases is $107 million.        Lease Payments Under Minimum Commitments        Related Sublease Rental Income       (millions of dollars)   2012   $ 2,152         $ 18    2013     1,696           17    2014     1,219           15    2015     802           12    2016     415           10    2017 and beyond     1,630           35    Total   $ 7,914         $ 107    Net rental cost under both cancelable and noncancelable operating leases incurred during 2011, 2010 and 2009 were as follows:        2011        2010        2009       (millions of dollars)   Rental cost   $ 4,061         $ 3,762         $ 4,426    Less sublease rental income     74           90           98    Net rental cost   $ 3,987         $ 3,672         $ 4,328

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Earnings Per Share	12 Months Ended
Dec. 31, 2011
Earnings Per Share [Abstract]
Earnings Per Share	11. Earnings Per Share        2011        2010        2009   Earnings per common share             Net income attributable to ExxonMobil (millions of dollars)   $ 41,060         $ 30,460         $ 19,280    Weighted average number of common shares outstanding (millions of shares)     4,870           4,885           4,832    Earnings per common share (dollars)   $ 8.43         $ 6.24         $ 3.99    Earnings per common share – assuming dilution             Net income attributable to ExxonMobil (millions of dollars)   $ 41,060         $ 30,460         $ 19,280    Weighted average number of common shares outstanding (millions of shares)     4,870           4,885           4,832    Effect of employee stock-based awards     5           12           16    Weighted average number of common shares outstanding – assuming dilution     4,875           4,897           4,848    Earnings per common share – assuming dilution (dollars)   $ 8.42         $ 6.22         $ 3.98    Dividends paid per common share (dollars)   $ 1.85         $ 1.74         $ 1.66

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Financial Instruments And Derivatives	12 Months Ended
Dec. 31, 2011
Financial Instruments And Derivatives [Abstract]
Financial Instruments And Derivatives	12. Financial Instruments and Derivatives Financial Instruments. The fair value of financial instruments is determined by reference to observable market data and other valuation techniques as appropriate. The only category of financial instruments where the difference between fair value and recorded book value is notable is long-term debt. The estimated fair value of total long-term debt, including capitalized lease obligations, was $9.8 billion and $12.8 billion at December 31, 2011, and 2010, respectively, as compared to recorded book values of $9.3 billion and $12.2 billion at December 31, 2011, and 2010, respectively. The fair value hierarchy for long-term debt is primarily Level 1 (quoted prices for identical assets in active markets).   Derivative Instruments. The Corporation's size, strong capital structure, geographic diversity and the complementary nature of the Upstream, Downstream and Chemical businesses reduce the Corporation's enterprise-wide risk from changes in interest rates, currency rates and commodity prices. As a result, the Corporation makes limited use of derivatives to mitigate the impact of such changes. The Corporation does not engage in speculative derivative activities or derivative trading activities nor does it use derivatives with leveraged features. When the Corporation does enter into derivative transactions, it is to offset exposures associated with interest rates, foreign currency exchange rates and hydrocarbon prices that arise from existing assets, liabilities and forecasted transactions. The cash flow hedge positions acquired as a result of the XTO merger were settled by December 31, 2011, and those programs have been discontinued. The estimated fair value of derivative instruments outstanding and recorded on the balance sheet was a net liability of $3 million at year-end 2011 and a net asset of $172 million at year-end 2010. Assets and liabilities associated with derivatives are predominantly recorded either in "Other current assets" or "Accounts payable and accrued liabilities." The Corporation's fair value measurement of its derivative instruments uses primarily Level 2 inputs (derivatives that are determined by either market prices on an active market for similar assets or by prices quoted by a broker or other market-corroborated prices). The Corporation recognized a before-tax gain or (loss) related to derivative instruments of $131 million, $221 million and $(73) million during 2011, 2010 and 2009, respectively. Income statement effects associated with derivatives are recorded either in "Sales and other operating revenue" or "Crude oil and product purchases." Of the amount stated above for 2011, cash flow hedges resulted in a before-tax gain of $136 million. The Corporation believes there are no material market or credit risks to the Corporation's financial position, results of operations or liquidity as a result of the derivative activities described above.

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Long-Term Debt	12 Months Ended
Dec. 31, 2011
Long-Term Debt [Abstract]
Long-Term Debt	13. Long-Term Debt At December 31, 2011, long-term debt consisted of $8,855 million due in U.S. dollars and $467 million representing the U.S. dollar equivalent at year-end exchange rates of amounts payable in foreign currencies. These amounts exclude that portion of long-term debt, totaling $3,431 million, which matures within one year and is included in current liabilities. The amounts of long-term debt maturing, in each of the four years after December 31, 2012, in millions of dollars, are: 2013 – $967, 2014 – $871, 2015 – $606 and 2016 – $503. At December 31, 2011, the Corporation's unused long-term credit lines were not material. Summarized long-term debt at year-end 2011 and 2010 are shown in the table below:        2011        2010       (millions of dollars)   SeaRiver Maritime Financial Holdings, Inc. (1)   Guaranteed deferred interest debentures due 2012        – Face value net of unamortized discount plus accrued interest   $ —         $ 2,389    XTO Energy Inc. (2)        7.500% senior note due 2012     —           199    5.900% senior note due 2012     —           233    6.250% senior note due 2013     185           193    4.625% senior note due 2013     145           149    5.750% senior note due 2013     346           359    4.900% senior note due 2014     260           267    5.000% senior note due 2015     138           142    5.300% senior note due 2015     255           262    5.650% senior note due 2016     222           227    6.250% senior note due 2017     513           534    5.500% senior note due 2018     402           420    6.500% senior note due 2018     506           524    6.100% senior note due 2036     203           204    6.750% senior note due 2037     317           329    6.375% senior note due 2038     241           258    Mobil Services (Bahamas) Ltd.        Variable note due 2035 (3)     972           972    Variable note due 2034 (4)     311           311    Mobil Producing Nigeria Unlimited (5)        Variable notes due 2012-2017     543           415    Esso (Thailand) Public Company Ltd. (6)        Variable notes due 2012-2017     413           522    Mobil Corporation        8.625% debentures due 2021     248           248    Industrial revenue bonds due 2012-2051 (7)     2,315           2,247    Other U.S. dollar obligations (8)     496           454    Other foreign currency obligations     31           65    Capitalized lease obligations (9)     260           304    Total long-term debt   $ 9,322         $ 12,227      (1) Additional information is provided for this subsidiary on the following pages.   (2) Includes premiums of $421 million.   (3) Average effective interest rate of 0.2% in 2011 and 0.3% in 2010.   (4) Average effective interest rate of 0.3% in 2011 and 0.4% in 2010.   (5) Average effective interest rate of 4.2% in 2011 and 4.6% in 2010.   (6) Average effective interest rate of 3.2% in 2011 and 1.7% in 2010.   (7) Average effective interest rate of 0.1% in 2011 and 0.2% in 2010.   (8) Average effective interest rate of 4.8% in 2011 and 4.7% in 2010.   (9) Average imputed interest rate of 8.5% in 2011 and 8.1% in 2010.   Condensed consolidating financial information related to guaranteed securities issued by subsidiaries   Exxon Mobil Corporation has fully and unconditionally guaranteed the deferred interest debentures due 2012 ($2,662 million short-term) of SeaRiver Maritime Financial Holdings, Inc., a 100-percent-owned subsidiary of Exxon Mobil Corporation. The following condensed consolidating financial information is provided for Exxon Mobil Corporation, as guarantor, and for SeaRiver Maritime Financial Holdings, Inc., as issuer, as an alternative to providing separate financial statements for the issuer. The accounts of Exxon Mobil Corporation and SeaRiver Maritime Financial Holdings, Inc. are presented utilizing the equity method of accounting for investments in subsidiaries.   Consolidating Consolidating Consolidating Consolidating Consolidating      Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated statement of income for 12 months ended December 31, 2011   Revenues and other income               Sales and other operating revenue, including sales-based taxes   $ 17,942       $ –       $ 449,087       $ –       $ 467,029    Income from equity affiliates     39,198         (14 )       15,196         (39,091 )       15,289    Other income     472         –         3,639         –         4,111    Intercompany revenue     54,891         3         451,627         (506,521 )       –    Total revenues and other income     112,503         (11 )       919,549         (545,612 )       486,429    Costs and other deductions               Crude oil and product purchases     57,604         –         704,125         (495,195 )       266,534    Production and manufacturing expenses     7,827         –         38,234         (5,793 )       40,268    Selling, general and administrative expenses     2,936         –         12,748         (701 )       14,983    Depreciation and depletion     1,660         –         13,923         –         15,583    Exploration expenses, including dry holes     219         –         1,862         –         2,081    Interest expense     305         274         4,512         (4,844 )       247    Sales-based taxes     –         –         33,503         –         33,503    Other taxes and duties     40         –         39,933         –         39,973    Total costs and other deductions     70,591         274         848,840         (506,533 )       413,172    Income before income taxes     41,912         (285 )       70,709         (39,079 )       73,257    Income taxes     852         (101 )       30,300         –         31,051    Net income including noncontrolling interests     41,060         (184 )       40,409         (39,079 )       42,206    Net income attributable to noncontrolling interests     –         –         1,146         –         1,146    Net income attributable to ExxonMobil   $ 41,060       $   (184)       $ 39,263       $ (39,079 )     $ 41,060         Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated statement of income for 12 months ended December 31, 2010   Revenues and other income               Sales and other operating revenue, including sales-based taxes   $ 15,382       $ –       $ 354,743       $ –       $ 370,125    Income from equity affiliates     28,401         (2 )       10,589         (28,311 )       10,677    Other income     790         –         1,629         –         2,419    Intercompany revenue     39,433         4         332,483         (371,920 )       –    Total revenues and other income     84,006         2         699,444         (400,231 )       383,221    Costs and other deductions               Crude oil and product purchases     40,788         –         518,961         (361,790 )       197,959    Production and manufacturing expenses     7,627         –         33,400         (5,235 )       35,792    Selling, general and administrative expenses     2,871         –         12,482         (670 )       14,683    Depreciation and depletion     1,761         –         12,999         –         14,760    Exploration expenses, including dry holes     251         –         1,893         –         2,144    Interest expense     217         246         4,035         (4,239 )       259    Sales-based taxes     –         –         28,547         –         28,547    Other taxes and duties     29         –         36,089         –         36,118    Total costs and other deductions     53,544         246         648,406         (371,934 )       330,262    Income before income taxes     30,462         (244 )       51,038         (28,297 )       52,959    Income taxes     2         (90 )       21,649         –         21,561    Net income including noncontrolling interests     30,460         (154 )       29,389         (28,297 )       31,398    Net income attributable to noncontrolling interests     –         –         938         –         938    Net income attributable to ExxonMobil   $ 30,460       $ (154 )     $ 28,451       $ (28,297 )     $ 30,460    Condensed consolidated statement of income for 12 months ended December 31, 2009   Revenues and other income               Sales and other operating revenue, including sales-based taxes   $ 11,352       $ –       $ 290,148       $ –       $ 301,500    Income from equity affiliates     19,852         7         7,060         (19,776 )       7,143    Other income     813         –         1,130         –         1,943    Intercompany revenue     30,889         4         271,663         (302,556 )       –    Total revenues and other income     62,906         11         570,001         (322,332 )       310,586    Costs and other deductions               Crude oil and product purchases     31,419         –         411,689         (290,302 )       152,806    Production and manufacturing expenses     7,811         –         30,805         (5,589 )       33,027    Selling, general and administrative expenses     2,574         –         12,852         (691 )       14,735    Depreciation and depletion     1,571         –         10,346         –         11,917    Exploration expenses, including dry holes     230         –         1,791         –         2,021    Interest expense     1,200         222         5,126         (6,000 )       548    Sales-based taxes     –         –         25,936         –         25,936    Other taxes and duties     (29 )       –         34,848         –         34,819    Total costs and other deductions     44,776         222         533,393         (302,582 )       275,809    Income before income taxes     18,130         (211 )       36,608         (19,750 )       34,777    Income taxes     (1,150 )       (81 )       16,350         –         15,119    Net income including noncontrolling interests     19,280         (130 )       20,258         (19,750 )       19,658    Net income attributable to noncontrolling interests     –         –         378         –         378    Net income attributable to ExxonMobil   $ 19,280       $     (130 )     $ 19,880       $ (19,750 )     $ 19,280      Condensed consolidating financial information related to guaranteed securities issued by subsidiaries   Consolidating Consolidating Consolidating Consolidating Consolidating      Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated balance sheet for year ended December 31, 2011   Cash and cash equivalents   $ 1,354       $ –       $ 11,310       $ –       $ 12,664    Cash and cash equivalents – restricted     239         –         165         –         404    Notes and accounts receivable – net     2,719         –         36,569         (646 )       38,642    Inventories     1,634         –         13,390         –         15,024    Other current assets     353         –         5,876         –         6,229    Total current assets     6,299         –         67,310         (646 )       72,963    Investments and other assets     260,410         393         485,157         (702,535 )       43,425    Property, plant and equipment – net     19,687         –         194,977         –         214,664    Intercompany receivables     17,325         2,726         543,844         (563,895 )       —    Total assets   $ 303,721       $ 3,119       $ 1,291,288       $ (1,267,076 )     $ 331,052    Notes and loans payable   $ 1,851       $ 2,662       $ 3,198       $ –       $ 7,711    Accounts payable and accrued liabilities     3,117         57         53,893         –         57,067    Income taxes payable     –         2         13,371         (646 )       12,727    Total current liabilities     4,968         2,721         70,462         (646 )       77,505    Long-term debt     293         –         9,029         –         9,322    Postretirement benefits reserves     12,344         –         12,650         –         24,994    Deferred income tax liabilities     1,450         –         35,168         –         36,618    Other long-term liabilities     5,215         –         16,654         –         21,869    Intercompany payables     125,055         386         438,454         (563,895 )       –    Total liabilities     149,325         3,107         582,417         (564,541 )       170,308    Earnings reinvested     330,939         (1,032 )       141,467         (140,435 )       330,939    Other equity     (176,543 )       1,044         561,056         (562,100 )       (176,543 )  ExxonMobil share of equity     154,396         12         702,523         (702,535 )       154,396    Noncontrolling interests     –         –         6,348         –         6,348    Total equity     154,396         12         708,871         (702,535 )       160,744    Total liabilities and equity   $ 303,721       $ 3,119       $ 1,291,288       $ (1,267,076 )     $ 331,052         Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated balance sheet for year ended December 31, 2010   Cash and cash equivalents   $ 309       $ –       $ 7,516       $ –       $ 7,825    Cash and cash equivalents – restricted     371         –         257         –         628    Notes and accounts receivable – net     2,104         –         30,346         (166 )       32,284    Inventories     1,457         –         11,519         –         12,976    Other current assets     239         –         5,032         –         5,271    Total current assets     4,480         –         54,670         (166 )       58,984    Investments and other assets     255,005         458         462,893         (674,378 )       43,978    Property, plant and equipment – net     18,830         –         180,718         –         199,548    Intercompany receivables     18,186         2,457         528,405         (549,048 )       –    Total assets   $ 296,501       $ 2,915       $ 1,226,686       $ (1,223,592 )     $ 302,510    Notes and loans payable   $ 1,042       $ 13       $ 1,732       $ –       $ 2,787    Accounts payable and accrued liabilities     2,987         –         47,047         –         50,034    Income taxes payable     –         3         9,975         (166 )       9,812    Total current liabilities     4,029         16         58,754         (166 )       62,633    Long-term debt     295         2,389         9,543         –         12,227    Postretirement benefits reserves     9,660         –         9,707         –         19,367    Deferred income tax liabilities     642         107         34,401         –         35,150    Other long-term liabilities     5,632         –         14,822         –         20,454    Intercompany payables     129,404         382         419,262         (549,048 )       –    Total liabilities     149,662         2,894         546,489         (549,214 )       149,831    Earnings reinvested     298,899         (848 )       132,357         (131,509 )       298,899    Other equity     (152,060 )       869         542,000         (542,869 )       (152,060 )  ExxonMobil share of equity     146,839         21         674,357         (674,378 )       146,839    Noncontrolling interests     –         –         5,840         –         5,840    Total equity     146,839         21         680,197         (674,378 )       152,679    Total liabilities and equity   $ 296,501       $   2,915       $ 1,226,686       $ (1,223,592 )     $ 302,510      Condensed consolidating financial information related to guaranteed securities issued by subsidiaries   Consolidating Consolidating Consolidating Consolidating Consolidating      Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated statement of cash flows for 12 months ended December 31, 2011   Cash provided by/(used in) operating activities   $ 37,752       $ 63       $ 47,683       $ (30,153 )     $ 55,345    Cash flows from investing activities               Additions to property, plant and equipment     (2,516 )       –         (28,459 )       –         (30,975 )  Proceeds associated with sales of long-term assets     667         –         10,466         –         11,133    Decrease/(increase) in restricted cash and cash equivalents     132         –         92         –         224    Net intercompany investing     (4,227 )       (229 )       4,015         441         –    All other investing, net     (1,679 )       –         (868 )       –         (2,547 )  Net cash provided by/(used in) investing activities     (7,623 )       (229 )       (14,754 )       441         (22,165 )  Cash flows from financing activities               Additions to short- and long-term debt     –         –         1,765         –         1,765    Reductions in short- and long-term debt     (2 )       (13 )       (1,354 )       –         (1,369 )  Additions/(reductions) in debt with three months or less maturity     809         –         752         –         1,561    Cash dividends     (9,020 )       –         (30,153 )       30,153         (9,020 )  Common stock acquired     (22,055 )       –         –         –         (22,055 )  Net intercompany financing activity     –         4         262         (266 )       –    All other financing, net     1,184         175         (322 )       (175 )       862    Net cash provided by/(used in) financing activities     (29,084 )       166         (29,050 )       29,712         (28,256 )  Effects of exchange rate changes on cash     –         –         (85 )       –         (85 )  Increase/(decrease) in cash and cash equivalents   $ 1,045       $ –       $ 3,794       $ –       $ 4,839    Condensed consolidated statement of cash flows for 12 months ended December 31, 2010   Cash provided by/(used in) operating activities   $ 35,740       $ 63       $ 18,307       $ (5,697 )     $ 48,413    Cash flows from investing activities               Additions to property, plant and equipment     (2,922 )       –         (23,949 )       –         (26,871 )  Proceeds associated with sales of long-term assets     1,484         –         1,777         –         3,261    Decrease/(increase) in restricted cash and cash equivalents     (371 )       –         (257 )       –         (628 )  Net intercompany investing     (13,966 )       (200 )       13,813         353         –    All other investing, net     (672 )       –         706         –         34    Net cash provided by/(used in) investing activities     (16,447 )       (200 )       (7,910 )       353         (24,204 )  Cash flows from financing activities               Additions to short- and long-term debt     –         –         1,741         –         1,741    Reductions in short- and long-term debt     (3 )       (13 )       (8,644 )       –         (8,660 )  Additions/(reductions) in debt with three months or less maturity     997         –         (288 )       –         709    Cash dividends     (8,498 )       –         (5,697 )       5,697         (8,498 )  Common stock acquired     (13,093 )       –         –         –         (13,093 )  Net intercompany financing activity     –         –         202         (202 )       –    All other financing, net     1,164         150         (286 )       (151 )       877    Net cash provided by/(used in) financing activities     (19,433 )       137         (12,972 )       5,344         (26,924 )  Effects of exchange rate changes on cash     –         –         (153 )       –         (153 )  Increase/(decrease) in cash and cash equivalents   $ (140 )     $ –       $ (2,728 )     $ –       $ (2,868 )      Consolidating Consolidating Consolidating Consolidating Consolidating      Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated statement of cash flows for 12 months ended December 31, 2009   Cash provided by/(used in) operating activities   $ 27,424       $ 72       $ 28,024       $ (27,082 )     $ 28,438    Cash flows from investing activities               Additions to property, plant and equipment     (2,686 )       –         (19,805 )       –         (22,491 )  Proceeds associated with sales of long-term assets     228         –         1,317         –         1,545    Decrease/(increase) in restricted cash and cash equivalents     –         –         –         –         –    Net intercompany investing     (1,826 )       (209 )       1,717         318         –    All other investing, net     –         –         (1,473 )       –         (1,473 )  Net cash provided by/(used in) investing activities     (4,284 )       (209 )       (18,244 )       318         (22,419 )  Cash flows from financing activities               Additions to short- and long-term debt     –         –         1,561         –         1,561    Reductions in short- and long-term debt     (3 )       (13 )       (1,627 )       –         (1,643 )  Additions/(reductions) in debt with three months or less maturity     39         –         (110 )       –         (71 )  Cash dividends     (8,023 )       –         (27,082 )       27,082         (8,023 )  Common stock acquired     (19,703 )       –         –         –         (19,703 )  Net intercompany financing activity     –         –         168         (168 )       –    All other financing, net     988         150         (392 )       (150 )       596    Net cash provided by/(used in) financing activities     (26,702 )       137         (27,482 )       26,764         (27,283 )  Effects of exchange rate changes on cash     –         –         520         –         520    Increase/(decrease) in cash and cash equivalents   $ (3,562 )     $ –       $ (17,182 )     $ –       $ (20,744 )

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Incentive Program	12 Months Ended
Dec. 31, 2011
Incentive Program [Abstract]
Incentive Program	14. Incentive Program The 2003 Incentive Program provides for grants of stock options, stock appreciation rights (SARs), restricted stock and other forms of award. Awards may be granted to eligible employees of the Corporation and those affiliates at least 50 percent owned. Outstanding awards are subject to certain forfeiture provisions contained in the program or award instrument. Options and SARs may be granted at prices not less than 100 percent of market value on the date of grant and have a maximum life of 10 years. The maximum number of shares of stock that may be issued under the 2003 Incentive Program is 220 million. Awards that are forfeited, expire or are settled in cash, do not count against this maximum limit. The 2003 Incentive Program does not have a specified term. New awards may be made until the available shares are depleted, unless the Board terminates the plan early. At the end of 2011, remaining shares available for award under the 2003 Incentive Program were 133,183 thousand. Restricted Stock. Awards totaling 10,533 thousand, 10,648 thousand (excluding XTO merger-related grants), and 10,133 thousand of restricted (nonvested) common stock and restricted (nonvested) common stock units were granted in 2011, 2010 and 2009, respectively. Compensation expense for these awards is based on the price of the stock at the date of grant and is recognized in income over the requisite service period. These shares are issued to employees from treasury stock. The units that are settled in cash are recorded as liabilities and their changes in fair value are recognized over the vesting period. During the applicable restricted periods, the shares may not be sold or transferred and are subject to forfeiture. The majority of the awards have graded vesting periods, with 50 percent of the shares in each award vesting after three years and the remaining 50 percent vesting after seven years. Awards granted to a small number of senior executives have vesting periods of five years for 50 percent of the award and of 10 years or retirement, whichever occurs later, for the remaining 50 percent of the award. Additionally, in 2010 long-term incentive awards totaling 4,206 thousand shares of restricted (nonvested) common stock, with a value of $250 million, were granted in association with the XTO merger. The majority of these awards vest over periods of up to three years after the initial grant. The Corporation has purchased shares in the open market and through negotiated transactions to offset shares issued in conjunction with benefit plans and programs. Purchases may be discontinued at any time without prior notice. The following tables summarize information about restricted stock and restricted stock units for the year ended December 31, 2011.       2011   Restricted stock and units outstanding   Shares      Weighted Average Grant-Date Fair Value per Share       (thousands)          Issued and outstanding at January 1     47,306       $ 69.74    2010 award issued in 2011     10,639       $ 68.74    Vested     (10,628 )     $ 64.37    Forfeited     (536 )     $ 67.35    Issued and outstanding at December 31     46,781       $ 70.76      Value of restricted stock and units   2011        2010        2009   Grant price   $ 79.52         $ 66.07         $ 75.40    Value at date of grant:           (millions of dollars)   Restricted stock and units settled in stock   $ 766         $ 672         $ 711    Merger-related granted and converted XTO awards     –           250           –    Units settled in cash     72           60           53    Total value   $ 838         $ 982         $ 764      As of December 31, 2011, there was $2,168 million of unrecognized compensation cost related to the nonvested restricted awards. This cost is expected to be recognized over a weighted-average period of 4.5 years. The compensation cost charged against income for the restricted stock and restricted units was $793 million, $801 million and $723 million for 2011, 2010 and 2009, respectively. The income tax benefit recognized in income related to this compensation expense was $73 million, $81 million and $76 million for the same periods, respectively. The fair value of shares and units vested in 2011, 2010 and 2009 was $801 million, $718 million and $763 million, respectively. Cash payments of $46 million, $42 million and $41 million for vested restricted stock units settled in cash were made in 2011, 2010 and 2009, respectively.     Stock Options. The Corporation has not granted any stock options under the 2003 Incentive Program. In 2010, the Corporation granted 12,393 thousand of converted XTO stock options with a grant-date fair value of $182 million as a result of the XTO merger. The grant included 893 thousand of unvested options. Compensation expense for these awards is based on estimated grant-date fair values. These stock options generally vest and become exercisable ratably over a three-year period, and may include a provision for accelerated vesting when the common stock price reaches specified levels. Some stock option tranches vest only when the common stock price reaches specified levels. As of December 31, 2011, unvested stock options of 226 thousand included 10 thousand options that vest ratably over three years and 216 thousand options that vest at a stock price of $126.80.   Changes that occurred in the Corporation's stock options in 2011 are summarized below:       2011          Stock options   Shares      Avg. Exercise Price        Weighted Average Remaining Contractual Term     (thousands)                 Outstanding at January 1     29,509       $ 44.65         Exercised     (23,880 )     $ 38.81         Forfeited     (80 )     $ 48.01         Outstanding at December 31     5,549       $ 69.76         3.0 Years Exercisable at December 31     5,323       $ 68.65         3.0 Years   Compensation expense of $1 million in 2011 and $2 million in 2010 fully expensed the nonvested merger-related XTO stock options. No compensation expense was recognized for stock options in 2009 as all remaining outstanding stock options at that time were fully vested. Cash received from stock option exercises was $924 million, $1,043 million and $752 million for 2011, 2010 and 2009, respectively. The cash tax benefit realized for the options exercised was $221 million, $89 million and $164 million for 2011, 2010 and 2009, respectively. The aggregate intrinsic value of stock options exercised in 2011, 2010 and 2009 was $986 million, $539 million and $563 million, respectively. The intrinsic value for the balance of outstanding stock options at December 31, 2011, was $98 million. The intrinsic value for the balance of exercisable stock options at December 31, 2011, was $97 million.

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Litigation And Other Contingencies	12 Months Ended
Dec. 31, 2011
Litigation And Other Contingencies [Abstract]
Litigation And Other Contingencies	15. Litigation and Other Contingencies Litigation. A variety of claims have been made against ExxonMobil and certain of its consolidated subsidiaries in a number of pending lawsuits. Management has regular litigation reviews, including updates from corporate and outside counsel, to assess the need for accounting recognition or disclosure of these contingencies. The Corporation accrues an undiscounted liability for those contingencies where the incurrence of a loss is probable and the amount can be reasonably estimated. If a range of amounts can be reasonably estimated and no amount within the range is a better estimate than any other amount, then the minimum of the range is accrued. The Corporation does not record liabilities when the likelihood that the liability has been incurred is probable but the amount cannot be reasonably estimated or when the liability is believed to be only reasonably possible or remote. For contingencies where an unfavorable outcome is reasonably possible and which are significant, the Corporation discloses the nature of the contingency and, where feasible, an estimate of the possible loss. For purposes of our contingency disclosures, "significant" includes material matters as well as other matters which management believes should be disclosed. ExxonMobil will continue to defend itself vigorously in these matters. Based on a consideration of all relevant facts and circumstances, the Corporation does not believe the ultimate outcome of any currently pending lawsuit against ExxonMobil will have a material adverse effect upon the Corporation's operations, financial condition, or financial statements taken as a whole. On June 30, 2011, a state district court jury in Baltimore County, Maryland returned a verdict against Exxon Mobil Corporation in Allison, et al v. Exxon Mobil Corporation, a case involving an accidental 26,000 gallon gasoline leak at a suburban Baltimore service station. The verdict included approximately $497 million in compensatory damages and approximately $1.0 billion in punitive damages in a finding that ExxonMobil fraudulently misled the plantiff-residents about the events leading up to the leak, the leak's discovery, and the nature and extent of any groundwater contamination. ExxonMobil believes the verdict is not justified by the evidence and that the amount of the compensatory award is grossly excessive and the imposition of punitive damages is improper and unconstitutional. The trial court denied a post-trial motion that ExxonMobil filed to overturn the punitive damages verdict. Following the entry of a final judgment, ExxonMobil will appeal the verdict and judgment. In a prior trial involving the same leak, the jury awarded plantiff-residents compensatory damages but decided against punitive damages. The plaintiffs did not appeal the jury's denial of punitive damages. Following an appeal by ExxonMobil of the compensatory damages award, on February 9, 2012, the Maryland Special Court of Appeals reversed in part and affirmed in part the trial court's decision on compensatory damages. The ultimate outcome of this litigation is not expected to have a material adverse effect upon the Corporation's operations, financial condition, or financial statements taken as a whole. Other Contingencies. The Corporation and certain of its consolidated subsidiaries were contingently liable at December 31, 2011, for guarantees relating to notes, loans and performance under contracts.         Dec. 31, 2011        Equity Company Obligations(1)        Other Third-Party Obligations        Total       (millions of dollars)   Guarantees             Debt-related   $ 1,546         $ 65         $ 1,611    Other     3,061           3,784           6,845    Total   $ 4,607         $ 3,849         $ 8,456      (1) ExxonMobil share. Additionally, the Corporation and its affiliates have numerous long-term sales and purchase commitments in their various business activities, all of which are expected to be fulfilled with no adverse consequences material to the Corporation's operations or financial condition. Unconditional purchase obligations as defined by accounting standards are those long-term commitments that are noncancelable or cancelable only under certain conditions, and that third parties have used to secure financing for the facilities that will provide the contracted goods or services.       Payments Due by Period        2012     2013- 2016     2017 and Beyond     Total       (millions of dollars)   Unconditional purchase obligations (1)   $ 243      $ 660      $ 410      $ 1,313      (1) Undiscounted obligations of $1,313 million mainly pertain to pipeline throughput agreements and include $856 million of obligations to equity companies. The present value of these commitments, which excludes imputed interest of $229 million, totaled $1,084 million. In accordance with a nationalization decree issued by Venezuela's president in February 2007, by May 1, 2007, a subsidiary of the Venezuelan National Oil Company (PdVSA) assumed the operatorship of the Cerro Negro Heavy Oil Project. This Project had been operated and owned by ExxonMobil affiliates holding a 41.67 percent ownership interest in the Project. The decree also required conversion of the Cerro Negro Project into a "mixed enterprise" and an increase in PdVSA's or one of its affiliate's ownership interest in the Project, with the stipulation that if ExxonMobil refused to accept the terms for the formation of the mixed enterprise within a specified period of time, the government would "directly assume the activities" carried out by the joint venture. ExxonMobil refused to accede to the terms proffered by the government, and on June 27, 2007, the government expropriated ExxonMobil's 41.67 percent interest in the Cerro Negro Project. ExxonMobil's remaining net book investment in Cerro Negro producing assets was about $750 million at year-end 2011. On September 6, 2007, affiliates of ExxonMobil filed a Request for Arbitration with the International Centre for Settlement of Investment Disputes (ICSID) invoking ICSID jurisdiction under Venezuela's Investment Law and the Netherlands-Venezuela Bilateral Investment Treaty. The ICSID Tribunal issued a decision on June 10, 2010, finding that it had jurisdiction to proceed on the basis of the Netherlands-Venezuela Bilateral Investment Treaty. The ICSID arbitration proceeding is continuing and a hearing on the merits was held in February 2012. At this time, the net impact of these matters on the Corporation's consolidated financial results cannot be reasonably estimated. Regardless, the Corporation does not expect the resolution to have a material effect upon the Corporation's operations or financial condition. An affiliate of ExxonMobil, Mobil Cerro Negro, Ltd. (MCN), also filed an arbitration under the rules of the International Chamber of Commerce (ICC) against PdVSA and a PdVSA affiliate, PdVSA CN, for breach of their contractual obligations under certain Cerro Negro Project agreements. On December 23, 2011, the tribunal rendered its award which found PdVSA and PdVSA CN jointly and severally liable to MCN in the amount of about $908 million. The tribunal deducted approximately $161 million of uncontested debt owed by MCN to PdVSA and PdVSA CN, leaving a balance of about $747 million. Post-award interest on this net amount was set at the New York prime rate compounded annually and running from the date of the award. The tribunal granted PdVSA and PdVSA CN a sixty-day grace period in which to comply with the award. On January 26, 2012, MCN filed a motion to confirm the award against PdVSA CN. In response to an order to show cause filed by PdVSA on January 17, 2012, the United States District Court for the Southern District of New York, on February 1, 2012, ordered the release to MCN of approximately $305 million of PdVSA CN funds previously attached in connection with the arbitration in partial satisfaction of the award. MCN received those funds on February 10, 2012. In further satisfaction of the award, PdVSA cancelled approximately $195 million in MCN bond debt on February 13, 2012. PdVSA paid MCN the balance of the monetary portion of the award on February 14, 2012. An affiliate of ExxonMobil is one of the Contractors under a Production Sharing Contract (PSC) with the Nigerian National Petroleum Corporation (NNPC) covering the Erha block located in the offshore waters of Nigeria. ExxonMobil's affiliate is the operator of the block and owns a 56.25 percent interest under the PSC. The Contractors are in dispute with NNPC regarding NNPC's lifting of crude oil in excess of its entitlement under the terms of the PSC. In accordance with the terms of the PSC, the Contractors initiated arbitration in Abuja, Nigeria, under the Nigerian Arbitration and Conciliation Act. On October 24, 2011, a three-member arbitral Tribunal issued an award upholding the Contractors' position in all material respects and awarding damages to the Contractors jointly in an amount of approximately $1.8 billion plus $234 million in accrued interest. The Contractors have petitioned a Nigerian federal court for enforcement of the award, and NNPC has petitioned the same court to have the award set aside. Those proceedings are pending. At this time, the net impact of this matter on the Corporation's consolidated financial results cannot be reasonably estimated. However, regardless of the outcome of enforcement proceedings, the Corporation does not expect the proceedings to have a material effect upon the Corporation's operations or financial condition.

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Pension And Other Postretirement Benefits	12 Months Ended
Dec. 31, 2011
Pension And Other Postretirement Benefits [Abstract]
Pension And Other Postretirement Benefits	16. Pension and Other Postretirement Benefits   The benefit obligations and plan assets associated with the Corporation's principal benefit plans are measured on December 31.                                                           Pension Benefits      Other Postretirement Benefits       U.S.      Non-U.S.           2011      2010      2011      2010      2011      2010       (percent)   Weighted-average assumptions used to determine benefit obligations at December 31                                                      Discount rate     5.00         5.50         4.00         4.80         5.00         5.50    Long-term rate of compensation increase     5.75         5.25         5.40         5.20         5.75         5.25            (millions of dollars)   Change in benefit obligation                                                      Benefit obligation at January 1   $ 15,007       $ 13,981       $ 25,722       $ 23,344       $ 7,331       $ 6,748    Service cost     546         468         574         480         121         101    Interest cost     792         798         1,267         1,175         393         395    Actuarial loss/(gain)     1,954         553         3,086         1,672         427         277    Benefits paid (1) (2)     (1,264 )       (873 )       (1,470 )       (1,281 )       (473 )       (394 )  Foreign exchange rate changes     –         –         (303 )       169         (11 )       26    Plan amendments, other     –         80         192         163         92         178    Benefit obligation at December 31   $ 17,035       $ 15,007       $ 29,068       $ 25,722       $ 7,880       $ 7,331    Accumulated benefit obligation at December 31   $ 14,081       $ 12,764       $ 25,480       $ 22,958       $ –       $ –      (1) Benefit payments for funded and unfunded plans.   (2) For 2011 and 2010, other postretirement benefits paid are net of $29 million and $15 million of Medicare subsidy receipts, respectively.   For U.S. plans, the discount rate is determined by constructing a portfolio of high-quality, noncallable bonds with cash flows that match estimated outflows for benefit payments. For major non-U.S. plans, the discount rate is determined by using bond portfolios with an average maturity approximating that of the liabilities or spot yield curves, both of which are constructed using high-quality, local-currency-denominated bonds. The measurement of the accumulated postretirement benefit obligation assumes an initial health care cost trend rate of 5.5 percent that declines to 4.5 percent by 2015. A one-percentage-point increase in the health care cost trend rate would increase service and interest cost by $63 million and the postretirement benefit obligation by $696 million. A one-percentage-point decrease in the health care cost trend rate would decrease service and interest cost by $49 million and the postretirement benefit obligation by $567 million.                                                         Pension Benefits      Other Postretirement Benefits       U.S.      Non-U.S.           2011      2010      2011      2010      2011      2010       (millions of dollars)   Change in plan assets                                                      Fair value at January 1   $ 10,835       $ 10,277       $ 16,765       $ 15,401       $ 558       $ 514    Actual return on plan assets     505         1,235         123         1,482         –         63    Foreign exchange rate changes     –         –         (192 )       99         –         –    Company contribution     370         –         1,623         1,184         39         38    Benefits paid (1)     (1,054 )       (677 )       (1,046 )       (873 )       (59 )       (59 )  Other     –         –         (156 )       (528 )       –         2    Fair value at December 31   $ 10,656       $ 10,835       $ 17,117       $ 16,765       $ 538       $ 558      (1) Benefit payments for funded plans.     The funding levels of all qualified pension plans are in compliance with standards set by applicable law or regulation. As shown in the table below, certain smaller U.S. pension plans and a number of non-U.S. pension plans are not funded because local tax conventions and regulatory practices do not encourage funding of these plans. All defined benefit pension obligations, regardless of the funding status of the underlying plans, are fully supported by the financial strength of the Corporation or the respective sponsoring affiliate.                                             Pension Benefits       U.S.            Non-U.S.        2011      2010             2011      2010       (millions of dollars)   Assets in excess of/(less than) benefit obligation                                          Balance at December 31                                          Funded plans   $ (4,141 )     $ (2,349 )           $ (5,319 )     $ (2,769 )  Unfunded plans     (2,238 )       (1,823 )             (6,632 )       (6,188 )  Total   $ (6,379 )     $ (4,172 )           $ (11,951 )     $ (8,957 )    The authoritative guidance for defined benefit pension and other postretirement plans requires an employer to recognize the overfunded or underfunded status of a defined benefit postretirement plan as an asset or liability in its statement of financial position and to recognize changes in that funded status in the year in which the changes occur through other comprehensive income.                                                                 Pension Benefits            Other Postretirement Benefits       U.S.            Non-U.S.                 2011      2010             2011      2010             2011      2010       (millions of dollars)   Assets in excess of/(less than) benefit obligation         Balance at December 31 (1)   $ (6,379 )     $ (4,172 )           $ (11,951 )     $ (8,957 )           $ (7,342 )     $ (6,773 )                    Amounts recorded in the consolidated balance sheet consist of:                                                                  Other assets   $ 1       $ 1             $ 245       $ 400             $ –       $ –    Current liabilities     (237 )       (257 )             (346 )       (336 )             (341 )       (343 )  Postretirement benefits reserves     (6,143 )       (3,916 )             (11,850 )       (9,021 )             (7,001 )       (6,430 )  Total recorded   $ (6,379 )     $ (4,172 )           $ (11,951 )     $ (8,957 )           $ (7,342 )     $ (6,773 )                    Amounts recorded in accumulated other comprehensive income consist of:                                                                  Net actuarial loss/(gain)   $ 6,475       $ 5,028             $ 11,170       $ 7,795             $ 2,291       $ 1,985    Prior service cost     74         83               745         674               119         154    Total recorded in accumulated other comprehensive income   $ 6,549       $ 5,111             $ 11,915       $ 8,469             $ 2,410       $ 2,139      (1) Fair value of assets less benefit obligation shown on the preceding page.     The long-term expected rate of return on funded assets shown below is established for each benefit plan by developing a forward-looking, long-term return assumption for each asset class, taking into account factors such as the expected real return for the specific asset class and inflation. A single, long-term rate of return is then calculated as the weighted average of the target asset allocation and the long-term return assumption for each asset class.                                                                                         Pension Benefits         Other Postretirement Benefits       U.S.         Non-U.S.              2011     2010     2009          2011     2010     2009          2011     2010     2009   Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31     (percent)    Discount rate     5.50        6.00        6.25            4.80        5.20        5.50            5.50        6.00        6.25    Long-term rate of return on funded assets     7.50        7.50        8.00            6.80        6.70        7.30            7.50        7.50        8.00    Long-term rate of compensation increase     5.25        5.25        5.00            5.20        5.00        4.70            5.25        5.25        5.00        Components of net periodic benefit cost     (millions of dollars)    Service cost   $ 546      $ 468      $ 438          $ 574      $ 480      $ 421          $ 121      $ 101      $ 94    Interest cost     792        798        809            1,267        1,175        1,121            393        395        408    Expected return on plan assets     (769 )      (726 )      (656 )          (1,168 )      (1,010 )      (886 )          (41 )      (37 )      (35 )  Amortization of actuarial loss/(gain)     485        525        694            647        554        648            162        147        176    Amortization of prior service cost     9        2        –            103        84        79            35        52        69    Net pension enhancement and curtailment/settlement expense     286        321        485            34        9        2            –        –        –    Net periodic benefit cost   $ 1,349      $ 1,388      $ 1,770          $ 1,457      $ 1,292      $ 1,385          $ 670      $ 658      $ 712    Changes in amounts recorded in accumulated other comprehensive income:                                                                                 Net actuarial loss/(gain)   $ 2,218      $ 44      $ (231 )        $ 4,133      $ 1,202      $ (33 )        $ 468      $ 251      $ (107 )  Amortization of actuarial (loss)/gain     (771 )      (846 )      (1,179 )          (681 )      (563 )      (650 )          (162 )      (147 )      (176 )  Prior service cost/(credit)     –        80        –            187        160        69            –        26        –    Amortization of prior service (cost)/credit     (9 )      (2 )      –            (103 )      (84 )      (79 )          (35 )      (52 )      (69 )  Foreign exchange rate changes     –        –        –            (90 )      96        608            —        2        2    Total recorded in other comprehensive income     1,438        (724 )      (1,410 )          3,446        811        (85 )          271        80        (350 )  Total recorded in net periodic benefit cost and other comprehensive income, before tax   $ 2,787      $ 664      $ 360          $ 4,903      $ 2,103      $ 1,300          $ 941      $ 738      $ 362    Costs for defined contribution plans were $378 million, $347 million and $339 million in 2011, 2010 and 2009, respectively. A summary of the change in accumulated other comprehensive income is shown in the table below:                                 Total Pension and Other Postretirement Benefits                2011                      2010                      2009           (Charge)/credit to other comprehensive income, before tax   (millions of dollars)   U.S. pension   $ (1,438 )     $ 724       $ 1,410    Non-U.S. pension     (3,446 )       (811 )       85    Other postretirement benefits     (271 )       (80 )       350    Total (charge)/credit to other comprehensive income, before tax     (5,155 )       (167 )       1,845    (Charge)/credit to income tax (see Note 18)     1,495         35         (591 )  (Charge)/credit to investment in equity companies     (30 )       11         (133 )  (Charge)/credit to other comprehensive income including noncontrolling interests, after tax   $ (3,690 )     $ (121 )     $ 1,121    Charge/(credit) to equity of noncontrolling interests     288         95         93    (Charge)/credit to other comprehensive income attributable to ExxonMobil   $ (3,402 )     $ (26 )     $ 1,214        The Corporation's investment strategy for benefit plan assets reflects a long-term view, a careful assessment of the risks inherent in various asset classes and broad diversification to reduce the risk of the portfolio. The benefit plan assets are primarily invested in passive equity and fixed income index funds to diversify risk while minimizing costs. The equity funds hold ExxonMobil stock only to the extent necessary to replicate the relevant equity index. The fixed income funds are largely invested in high-quality corporate and government debt securities. Studies are periodically conducted to establish the preferred target asset allocation. The target asset allocation for the U.S. benefit plans is 50 percent equity securities and 50 percent debt securities. The target asset allocation for the non-U.S. plans in aggregate is 47 percent equities, 50 percent debt and 3 percent real estate funds. The equity targets for the U.S. and non-U.S. plans include an allocation to private equity partnerships that primarily focus on early-stage venture capital of 5 percent and 3 percent, respectively. The fair value measurement levels are accounting terms that refer to different methods of valuing assets. The terms do not represent the relative risk or credit quality of an investment.   The 2011 fair value of the benefit plan assets, including the level within the fair value hierarchy, is shown in the tables below:                                                                             U.S. Pension         Non-U.S. Pension       Fair Value Measurement at December 31, 2011, Using:               Fair Value Measurement at December 31, 2011, Using:              Quoted Prices in Active Markets for Identical Assets (Level 1)     Significant Other Observable Inputs (Level 2)     Significant Unobservable Inputs (Level 3)     Total          Quoted Prices in Active Markets for Identical Assets (Level 1)     Significant Other Observable Inputs (Level 2)     Significant Unobservable Inputs (Level 3)     Total       (millions of dollars)         (millions of dollars)   Asset category:                                                                     Equity securities                                                                     U.S.   $    –      $ 2,247 (1)     $ –      $ 2,247          $ –      $ 2,589 (1)    $ –      $ 2,589    Non-U.S.     –        2,636 (1)      –        2,636            194 (2)      4,835 (1)      –        5,029    Private equity     –        –        458 (3)      458            –        –        393 (3)      393    Debt securities                                                                     Corporate     –        2,728 (4)      –        2,728            2 (5)      1,857 (4)      –        1,859    Government     –        2,482 (4)      –        2,482            186 (5)      6,317 (4)      –        6,503    Asset-backed     –        11 (4)      –        11            –        102 (4)      –        102    Private mortgages     –        –        –        –            –        –        4 (6)      4    Real estate funds     –        –        –        –            –        –        397 (7)      397    Cash     –        71 (8)       –        71            76        13 (9)       –        89    Total at fair value   $    –      $ 10,175      $ 458      $ 10,633          $ 458      $ 15,713      $ 794      $ 16,965    Insurance contracts at contract value                             23                                    152    Total plan assets                           $ 10,656                                  $ 17,117       (1) For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.   (2) For non-U.S. equity securities held in separate accounts, fair value is based on observable quoted prices on active exchanges.   (3) For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.   (4) For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.   (5) For corporate and government debt securities that are traded on active exchanges, fair value is based on observable quoted prices.   (6) For private mortgages, fair value is based on proprietary credit spread matrices developed using market data and monthly surveys of active mortgage bankers.   (7) For real estate funds, fair value is based on appraised values developed using comparable market transactions.   (8) For cash balances held in the form of short-term fund units that are redeemable at the measurement date, the fair value is treated as a Level 2 input.   (9) For cash balances that are subject to withdrawal penalties or other adjustments, the fair value is treated as a Level 2 input.                                           Other Postretirement       Fair Value Measurement at December 31, 2011, Using:               Quoted Prices in Active Markets for Identical Assets (Level 1)        Significant Other Observable Inputs (Level 2)      Significant Unobservable Inputs (Level 3)      Total       (millions of dollars)   Asset category:                                      Equity securities                                      U.S.   $   –         $ 166 (1)     $   –       $ 166    Non-U.S.     –           155 (1)       –         155    Private equity     –           –         7 (2)       7    Debt securities                                      Corporate     –           77 (3)       –         77    Government     –           120 (3)       –         120    Asset-backed     –           12 (3)       –         12    Private mortgages     –           –         –         –    Cash     –           1         –         1    Total at fair value   $   –         $ 531       $   7       $ 538      (1) For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.   (2) For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.   (3) For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions. The change in the fair value in 2011 of Level 3 assets that use significant unobservable inputs to measure fair value is shown in the table below:                                                                         2011       Pension             Other Postretirement       U.S.           Non U.S.                             Private Equity      Private Mortgages            Private Equity      Private Mortgages      Real Estate              Private Equity      Private Mortgages       (millions of dollars)                       Fair value at January 1   $ 408       $ 128            $ 315       $ 4       $ 417              $ 5       $ 2                        Net realized gains/(losses)     1         5              7         –         3                –         –    Net unrealized gains/(losses)     56         –              33         –         6                2         –    Net purchases/(sales)     (7 )       (133 )            38         –         (29)                –         (2)    Fair value at December 31   $ 458       $ –            $ 393       $ 4       $ 397              $ 7       $ –      The 2010 fair value of the benefit plan assets, including the level within the fair value hierarchy, is shown in the tables below:                                                                             U.S. Pension         Non-U.S. Pension       Fair Value Measurement at December 31, 2010, Using:               Fair Value Measurement at December 31, 2010, Using:              Quoted Prices in Active Markets for Identical Assets (Level 1)     Significant Other Observable Inputs (Level 2)     Significant Unobservable Inputs (Level 3)     Total          Quoted Prices in Active Markets for Identical Assets (Level 1)     Significant Other Observable Inputs (Level 2)     Significant Unobservable Inputs (Level 3)     Total       (millions of dollars)         (millions of dollars)   Asset category:                                                                     Equity securities                                                                     U.S.   $     –      $ 2,648 (1)     $ –      $ 2,648          $ –      $ 2,443 (1)    $ –      $ 2,443    Non-U.S.     –        3,530 (1)      –        3,530            228 (2)       6,502 (1)      –        6,730    Private equity     –        –        408 (3)       408            –        –        315 (3)       315    Debt securities                                                                     Corporate     –        1,152 (4)       –        1,152            2 (5)       1,629 (4)      –        1,631    Government     –        2,847 (4)      –        2,847            146 (5)       4,709 (4)      –        4,855    Asset-backed     –        31 (4)      –        31            –        98 (4)      –        98    Private mortgages     –        –        128 (6)       128            –        –        4 (6)      4    Real estate funds     –        –        –        –            –        –        417 (7)      417    Cash     68        –        –        68            63        51 (8)       –        114    Total at fair value   $   68      $ 10,208      $ 536      $ 10,812          $ 439      $ 15,432      $ 736      $ 16,607    Insurance contracts at contract value                             23                                    158    Total plan assets                           $ 10,835                                  $ 16,765      (1) For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.   (2) For non-U.S. equity securities held in separate accounts, fair value is based on observable quoted prices on active exchanges.   (3) For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.   (4) For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.   (5) For corporate and government debt securities that are traded on active exchanges, fair value is based on observable quoted prices.   (6) For private mortgages, fair value is based on proprietary credit spread matrices developed using market data and monthly surveys of active mortgage bankers.   (7) For real estate funds, fair value is based on appraised values developed using comparable market transactions.   (8) For cash balances that are subject to withdrawal penalties or other adjustments, the fair value is treated as a Level 2 input.                                         Other Postretirement       Fair Value Measurement at December 31, 2010, Using:               Quoted Prices in Active Markets for Identical Assets (Level 1)        Significant Other Observable Inputs (Level 2)      Significant Unobservable Inputs (Level 3)      Total       (millions of dollars)   Asset category:                                      Equity securities                                      U.S.   $ –         $ 180 (1)     $ –       $ 180    Non-U.S.     –           191 (1)       –         191    Private equity     –           –         5 (2)       5    Debt securities                                      Corporate     –           49 (3)       –         49    Government     –           117 (3)       –         117    Asset-backed     –           13 (3)       –         13    Private mortgages     –           –         2 (4)       2    Cash       1           –           –         1    Total at fair value   $ 1         $ 550       $ 7       $ 558      (1) For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.   (2) For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.   (3) For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.   (4) For private mortgages, fair value is based on proprietary credit spread matrices developed using market data and monthly surveys of active mortgage bankers. The change in the fair value in 2010 of Level 3 assets that use significant unobservable inputs to measure fair value is shown in the table below:                                                                         2010       Pension          Other Postretirement       U.S.          Non U.S.                            Private Equity        Private Mortgages           Private Equity      Private Mortgages      Real Estate           Private Equity        Private Mortgages       (millions of dollars)                       Fair value at January 1   $ 349         $ 280           $ 239       $ 5       $ 413           $ 4         $ 3                        Net realized gains/(losses)     –           36             (1 )       (1 )       –             –           1    Net unrealized gains/(losses)     47           (3 )           26         1         (4 )           1           –    Net purchases/(sales)     12           (185 )           51         (1 )       8             –           (2 )  Fair value at December 31   $ 408         $ 128           $ 315       $ 4       $ 417           $ 5         $ 2    A summary of pension plans with an accumulated benefit obligation in excess of plan assets is shown in the table below:                                             Pension Benefits       U.S.         Non-U.S.        2011     2010          2011     2010       (millions of dollars)   For funded pension plans with an accumulated benefit obligation in excess of plan assets:                                     Projected benefit obligation   $ 14,797      $ 13,184          $ 17,668      $ 9,865    Accumulated benefit obligation     12,606        11,383            16,175        9,074    Fair value of plan assets     10,655        10,834            12,832        7,131                For unfunded pension plans:                                     Projected benefit obligation   $ 2,238      $ 1,823          $ 6,632      $ 6,188    Accumulated benefit obligation     1,475        1,381            5,753        5,413                                        Pension Benefits         Other Postretirement Benefits        U.S.     Non-U.S.              (millions of dollars)   Estimated 2012 amortization from accumulated other comprehensive income:                             Net actuarial loss/(gain) (1)   $ 1,033      $ 889          $ 173    Prior service cost (2)     7        109            34      (1) The Corporation amortizes the net balance of actuarial losses/(gains) as a component of net periodic benefit cost over the average remaining service period of active plan participants.   (2) The Corporation amortizes prior service cost on a straight-line basis as permitted under authoritative guidance for defined benefit pension and other postretirement benefit plans.                                                Pension Benefits            Other Postretirement Benefits           U.S.        Non-U.S.             Gross        Medicare Subsidy Receipt          (millions of dollars)               Contributions expected in 2012      $ 1,650         $ 1,250             $ –         $ –    Benefit payments expected in:                                                 2012        1,490           1,342               442           23    2013        1,579           1,360               458           25    2014        1,547           1,383               472           26    2015        1,524           1,418               485           27    2016        1,489           1,462               497           28    2017 - 2021        6,616           7,731               2,611           163

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Disclosures About Segments And Related Information	12 Months Ended
Dec. 31, 2011
Disclosures About Segments And Related Information [Abstract]
Disclosures About Segments And Related Information	17. Disclosures about Segments and Related Information The Upstream, Downstream and Chemical functions best define the operating segments of the business that are reported separately. The factors used to identify these reportable segments are based on the nature of the operations that are undertaken by each segment. The Upstream segment is organized and operates to explore for and produce crude oil and natural gas. The Downstream segment is organized and operates to manufacture and sell petroleum products. The Chemical segment is organized and operates to manufacture and sell petrochemicals. These segments are broadly understood across the petroleum and petrochemical industries. These functions have been defined as the operating segments of the Corporation because they are the segments (1) that engage in business activities from which revenues are earned and expenses are incurred; (2) whose operating results are regularly reviewed by the Corporation's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance; and (3) for which discrete financial information is available. Earnings after income tax include special items, and transfers are at estimated market prices. Earnings for 2009 included a special charge of $140 million in the corporate and financing segment for interest related to the Valdez punitive damages award. Interest expense includes non-debt-related interest expense of $165 million, $41 million and $500 million in 2011, 2010 and 2009, respectively. Higher expenses in 2009 primarily reflect interest provisions related to the Valdez litigation. In corporate and financing activities, interest revenue relates to interest earned on cash deposits and marketable securities.         Upstream     Downstream     Chemical     Corporate  and Financing     Corporate Total        U.S.     Non-U.S.     U.S.     Non-U.S.     U.S.     Non-U.S.           (millions of dollars)   As of December 31, 2011                 Earnings after income tax   $ 5,096      $ 29,343      $ 2,268      $ 2,191      $ 2,215      $ 2,168      $ (2,221 )    $ 41,060    Earnings of equity companies included above     2,045        11,768        7        353        198        1,365        (447 )      15,289    Sales and other operating revenue (1)     14,023        32,419        120,844        257,779        15,466        26,476        22        467,029    Intersegment revenue     9,807        49,910        18,489        73,549        12,226        10,563        262        –    Depreciation and depletion expense     4,879        7,021        650        1,560        380        458        635        15,583    Interest revenue     –        –        –        –        –        –        135        135    Interest expense     30        36        10        24        2        (1 )      146        247    Income taxes     2,852        25,755        1,123        696        1,027        465        (867 )      31,051    Additions to property, plant and equipment     10,887        18,934        400        1,334        241        910        932        33,638    Investments in equity companies     2,963        8,439        210        1,358        253        3,973        (228 )      16,968    Total assets     82,900        127,977        18,354        51,132        7,245        19,862        23,582        331,052    As of December 31, 2010                 Earnings after income tax   $ 4,272      $ 19,825      $ 770      $ 2,797      $ 2,422      $ 2,491      $ (2,117 )    $ 30,460    Earnings of equity companies included above     1,261        8,415        23        225        171        1,163        (581 )      10,677    Sales and other operating revenue (1)     8,895        26,046        93,599        206,042        13,402        22,119        22        370,125    Intersegment revenue     8,102        39,066        13,546        52,697        9,694        8,421        282        –    Depreciation and depletion expense     3,506        7,574        681        1,565        421        432        581        14,760    Interest revenue     –        –        –        –        –        –        118        118    Interest expense     20        25        1        19        1        4        189        259    Income taxes     2,219        18,627        360        560        736        347        (1,288 )      21,561    Additions to property, plant and equipment     52,300        16,937        888        1,332        247        1,733        719        74,156    Investments in equity companies     2,636        9,625        254        1,240        285        3,586        (197 )      17,429    Total assets     76,725        115,646        18,378        47,402        7,148        19,087        18,124        302,510    As of December 31, 2009                 Earnings after income tax   $ 2,893      $ 14,214      $ (153 )    $ 1,934      $ 769      $ 1,540      $ (1,917 )    $ 19,280    Earnings of equity companies included above     1,216        5,269        (102 )      188        164        906        (498 )      7,143    Sales and other operating revenue (1)     3,406        21,355        76,467        173,404        9,962        16,885        21        301,500    Intersegment revenue     6,718        32,982        10,168        39,190        7,185        6,947        284        –    Depreciation and depletion expense     1,768        6,376        687        1,665        400        457        564        11,917    Interest revenue     –        –        –        –        –        –        179        179    Interest expense     38        27        10        18        4        1        450        548    Income taxes     1,451        15,183        (164 )      (22 )      281        (182 )      (1,428 )      15,119    Additions to property, plant and equipment     2,973        13,307        1,449        1,447        294        2,553        468        22,491    Investments in equity companies     2,440        8,864        323        1,190        259        2,873        (207 )      15,742    Total assets     24,940        102,372        17,493        45,098        7,044        17,117        19,259        233,323        Geographic Sales and other operating revenue (1)   2011     2010     2009       (millions of dollars)   United States   $ 150,343      $ 115,906      $ 89,847    Non-U.S.     316,686        254,219        211,653    Total   $ 467,029      $ 370,125      $ 301,500    Significant non-U.S. revenue sources include:   United Kingdom   $ 34,833      $ 24,637      $ 20,293    Canada     34,626        27,243        21,151    Japan     31,925        27,143        22,054    Belgium     26,926        21,139        16,857    France     18,510        13,920        12,042    Germany     17,034        14,301        14,839    Italy     16,288        14,132        12,997    Singapore     14,400        11,088        8,400      Long-lived assets   2011     2010     2009       (millions of dollars)   United States   $ 91,146      $ 86,021      $ 37,138    Non-U.S.     123,518        113,527        101,978    Total   $ 214,664      $ 199,548      $ 139,116    Significant non-U.S. long-lived assets include:   Canada   $ 24,458      $ 20,879      $ 15,919    Nigeria     11,806        11,429        11,046    Angola     10,395        8,570        7,320    Australia     9,474        6,570        4,247    Singapore     9,285        8,610        7,238    Kazakhstan     7,022        5,938        4,748    Norway     6,039        6,988        7,251    United Kingdom     5,008        6,177        7,609      (1) Sales and other operating revenue includes sales-based taxes of $33,503 million for 2011, $28,547 million for 2010 and $25,936 million for 2009. See Note 1, Summary of Accounting Policies.

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Income, Sales-Based And Other Taxes	12 Months Ended
Dec. 31, 2011
Income, Sales-Based And Other Taxes [Abstract]
Income, Sales-Based And Other Taxes	18. Income, Sales-Based and Other Taxes       2011     2010     2009        U.S.     Non-U.S.     Total     U.S.     Non-U.S.     Total     U.S.     Non-U.S.     Total       (millions of dollars)   Income tax expense                   Federal and non-U.S.                   Current   $ 1,547      $ 28,849      $ 30,396      $ 1,224      $ 21,093      $ 22,317      $ (838 )    $ 15,830      $ 14,992    Deferred – net     1,577        (1,417 )      160        49        (1,191 )      (1,142 )      650        (665 )      (15 )  U.S. tax on non-U.S. operations     15        –        15        46        –        46        32        –        32    Total federal and non-U.S.     3,139        27,432        30,571        1,319        19,902        21,221        (156 )      15,165        15,009    State     480        –        480        340        –        340        110        –        110    Total income tax expense     3,619        27,432        31,051        1,659        19,902        21,561        (46 )      15,165        15,119    Sales-based taxes     5,652        27,851        33,503        6,182        22,365        28,547        6,271        19,665        25,936    All other taxes and duties                   Other taxes and duties     1,539        38,434        39,973        776        35,342        36,118        581        34,238        34,819    Included in production and manufacturing expenses     1,342        1,425        2,767        1,001        1,237        2,238        699        1,318        2,017    Included in SG&A expenses     181        623        804        201        570        771        197        538        735    Total other taxes and duties     3,062        40,482        43,544        1,978        37,149        39,127        1,477        36,094        37,571    Total   $ 12,333      $ 95,765      $ 108,098      $ 9,819      $ 79,416      $ 89,235      $ 7,702      $ 70,924      $ 78,626      All other taxes and duties include taxes reported in production and manufacturing and selling, general and administrative (SG&A) expenses. The above provisions for deferred income taxes include net credits of $330 million in 2011 and $9 million in 2009 and a net charge of $175 million in 2010 for the effect of changes in tax laws and rates. Income taxes (charged)/credited directly to equity were:        2011     2010     2009       (millions of dollars)   Cumulative foreign exchange translation adjustment   $ 89      $ (42 )    $ (247 )  Postretirement benefits reserves adjustment:       Net actuarial loss/(gain)     2,016        553        (94 )  Amortization of actuarial loss/(gain)     (503 )      (609 )      (649 )  Prior service cost     47        92        20    Amortization of prior service cost     (41 )      (45 )      (43 )  Foreign exchange rate changes     (24 )      44        175    Total postretirement benefits reserves adjustment     1,495        35        (591 )  Other components of equity     236        246        140    The reconciliation between income tax expense and a theoretical U.S. tax computed by applying a rate of 35 percent for 2011, 2010 and 2009 is as follows:        2011     2010     2009       (millions of dollars)   Income before income taxes       United States   $ 11,511      $ 7,711      $ 2,576    Non-U.S.     61,746        45,248        32,201    Total   $ 73,257      $ 52,959      $ 34,777    Theoretical tax   $ 25,640      $ 18,536      $ 12,172    Effect of equity method of accounting     (5,351 )      (3,737 )      (2,500 )  Non-U.S. taxes in excess of theoretical U.S. tax     10,385        7,293        5,948    U.S. tax on non-U.S. operations     15        46        32    State taxes, net of federal tax benefit     312        221        72    Other U.S.     50        (798 )      (605 )  Total income tax expense   $ 31,051      $ 21,561      $ 15,119    Effective tax rate calculation       Income taxes   $ 31,051      $ 21,561      $ 15,119    ExxonMobil share of equity company income taxes     5,603        4,058        2,489    Total income taxes     36,654        25,619        17,608    Net income including noncontrolling interests     42,206        31,398        19,658    Total income before taxes   $ 78,860      $ 57,017      $ 37,266    Effective income tax rate         46%            45%            47%      Deferred income taxes reflect the impact of temporary differences between the amount of assets and liabilities recognized for financial reporting purposes and such amounts recognized for tax purposes. Deferred tax liabilities/(assets) are comprised of the following at December 31:   Tax effects of temporary differences for:   2011     2010       (millions of dollars)   Property, plant and equipment   $ 45,951      $ 42,657    Other liabilities     4,281        4,278    Total deferred tax liabilities   $ 50,232      $ 46,935    Pension and other postretirement benefits   $ (7,930 )    $ (5,634 )  Asset retirement obligations     (5,302 )      (4,461 )  Tax loss carryforwards     (3,166 )      (3,243 )  Other assets     (7,079 )      (6,070 )  Total deferred tax assets   $ (23,477 )    $ (19,408 )  Asset valuation allowances     1,304        1,183    Net deferred tax liabilities   $ 28,059      $ 28,710    Deferred income tax (assets) and liabilities are included in the balance sheet as shown below. Deferred income tax (assets) and liabilities are classified as current or long term consistent with the classification of the related temporary difference – separately by tax jurisdiction.   Balance sheet classification   2011     2010       (millions of dollars)   Other current assets   $ (4,549 )    $ (3,359 )  Other assets, including intangibles, net     (4,218 )      (3,527 )  Accounts payable and accrued liabilities     208        446    Deferred income tax liabilities     36,618        35,150    Net deferred tax liabilities   $ 28,059      $ 28,710    The Corporation had $47 billion of indefinitely reinvested, undistributed earnings from subsidiary companies outside the U.S. Unrecognized deferred taxes on remittance of these funds are not expected to be material. Unrecognized Tax Benefits The Corporation is subject to income taxation in many jurisdictions around the world. Unrecognized tax benefits reflect the difference between positions taken or expected to be taken on income tax returns and the amounts recognized in the financial statements. Resolution of the related tax positions through negotiations with the relevant tax authorities or through litigation will take many years to complete. It is difficult to predict the timing of resolution for tax positions since such timing is not entirely within the control of the Corporation. It is reasonably possible that the total amount of unrecognized tax benefits could increase by up to 50 percent in the next 12 months, with no material impact on near-term earnings. Given the long time periods involved in resolving tax positions, the Corporation does not expect that the recognition of unrecognized tax benefits will have a material impact on the Corporation's effective income tax rate in any given year. The following table summarizes the movement in unrecognized tax benefits.   Gross unrecognized tax benefits   2011     2010     2009       (millions of dollars)   Balance at January 1   $ 4,148      $ 4,725      $ 4,976    Additions based on current year's tax positions     822        830        547    Additions for prior years' tax positions     451        620        262    Reductions for prior years' tax positions     (329 )      (505 )      (594 )  Reductions due to lapse of the statute of limitations     –        (534 )      –    Settlements with tax authorities     (145 )      (999 )      (592 )  Foreign exchange effects/other     (25 )      11        126    Balance at December 31   $ 4,922      $ 4,148      $ 4,725    The additions and reductions in unrecognized tax benefits shown above include effects related to net income and equity, and timing differences for which the ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility. The 2011, 2010 and 2009 changes in unrecognized tax benefits did not have a material effect on the Corporation's net income or cash flow. The following table summarizes the tax years that remain subject to examination by major tax jurisdiction:   Country of Operation    Open Tax Years Abu Dhabi    2000 - 2011 Angola    2007 - 2011 Australia    2000 - 2011 Canada    1994 - 2011 Equatorial Guinea    2006 - 2011 Germany    1999 - 2011 Japan    2004 - 2011 Malaysia    2005 - 2011 Nigeria    1998 - 2011 Norway    2000 - 2011 United Kingdom    2009 - 2011 United States    2004 - 2011 The Corporation classifies interest on income tax-related balances as interest expense or interest income and classifies tax-related penalties as operating expense. The Corporation incurred $62 million in interest expense on income tax reserves in 2011. For 2010, interest expense was a credit of $39 million, reflecting the effect of credits from the net favorable resolution of prior year tax positions. The Corporation incurred approximately $135 million in interest expense on income tax reserves in 2009. The related interest payable balances were $662 million and $636 million at December 31, 2011, and 2010, respectively.

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Acquisition Of XTO Energy Inc.	12 Months Ended
Dec. 31, 2011
Acquisition Of XTO Energy Inc. [Abstract]
Acquisition Of XTO Energy Inc.	19. Acquisition of XTO Energy Inc. Description of the Transaction. On June 25, 2010, ExxonMobil acquired XTO Energy Inc. (XTO) by merging a wholly-owned subsidiary of ExxonMobil with and into XTO (the "merger"), with XTO continuing as the surviving corporation and wholly-owned subsidiary of ExxonMobil. XTO is involved in the exploration for, production of, and transportation and sale of crude oil and natural gas. At the effective time of the merger, each share of XTO common stock was converted into the right to receive 0.7098 shares of common stock of ExxonMobil (the "Exchange Ratio"), with cash being paid in lieu of any fractional shares of ExxonMobil stock. Also at the effective time, each outstanding option to purchase XTO common stock was converted into an option to purchase a number of shares of ExxonMobil stock based on the Exchange Ratio, and each outstanding stock-based award of XTO was converted into a stock-based award of ExxonMobil stock based on the Exchange Ratio. The components of the consideration transferred follow:                 (millions of dollars)   Consideration attributable to stock issued (1) (2)   $ 24,480    Consideration attributable to converted stock options (2)     179    Total consideration transferred   $ 24,659      (1) The fair value of the Corporation's common stock on the acquisition date was $59.10 per share based on the closing value on the NYSE. The Corporation issued 416 million shares of stock previously held in treasury. The treasury stock issued, based on the average cost, was valued at $21,139 million. The excess of the fair value of the consideration transferred over the cost of treasury stock issued was $3,520 million and was included in common stock without par value. (2) The portion of the fair value of XTO converted stock-based awards attributable to pre-merger employee service was part of consideration. The remaining fair value of the awards is recognized over the requisite service period. Recording of Assets Acquired and Liabilities Assumed. The transaction was accounted for using the acquisition method of accounting, which requires, among other things, that assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. The following table summarizes the assets acquired and liabilities assumed:   (millions of dollars)   Current assets   $ 2,053    Property, plant and equipment (1)     47,300    Goodwill (2)     39    Other assets     620    Total assets acquired   $ 50,012    Current liabilities   $ 2,615    Long-term debt (3)     10,574    Deferred income tax liabilities (4)     11,204    Other long-term obligations     960    Total liabilities assumed   $ 25,353    Net assets acquired   $ 24,659      (1) Property, plant and equipment were measured primarily using an income approach. The fair value measurements of the oil and gas assets were based, in part, on significant inputs not observable in the market and thus represent a Level 3 measurement. The significant inputs included XTO resources, assumed future production profiles, commodity prices (mainly based on observable market inputs), risk adjusted discount rate of 7 percent, inflation of 2 percent and assumptions on the timing and amount of future development and operating costs. The property, plant and equipment additions were segmented to the Upstream business, with substantially all of the assets in the United States.   (2) Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill was recognized in the Upstream reporting unit. Goodwill is not amortized and is not deductible for tax purposes. (3) Long-term debt was recognized at market rates at closing (Level 1). (4) Deferred income taxes reflect the temporary differences between the amount of assets and liabilities recognized for financial reporting purposes and such amounts recognized for tax purposes. The 2010 unaudited pro forma revenues of $373 billion, net income attributable to ExxonMobil of $31 billion, earnings per common share of $6.03 and earnings per common share assuming dilution of $6.01 for the Corporation were calculated as if the merger of XTO had occurred at the beginning of 2010. The historical financial information was adjusted to give effect to the pro forma events that were directly attributable to the merger and factually supportable. The unaudited pro forma consolidated results are not necessarily indicative of what the consolidated results of operations actually would have been had the merger been completed on January 1, 2010. In addition, the unaudited pro forma consolidated results do not purport to project the future results of operations of the combined company. The unaudited pro forma consolidated results reflect pro forma adjustments for the elimination of deferred gains and losses recognized in earnings for derivatives outstanding at the beginning of the year, depreciation expense related to the fair value adjustment to property, plant and equipment acquired, additional amortization expense related to the fair value of identifiable intangible assets acquired, capitalization of interest expense and applicable income tax impacts.

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Subsequent Event	12 Months Ended
Dec. 31, 2011
Subsequent Event [Abstract]
Subsequent Event	20. Subsequent Event On January 29, 2012, the Corporation announced that it had entered into an agreement which will result in the restructuring of its Downstream and Chemical holdings in Japan. Under the agreement, TonenGeneral Sekiyu K. K. (TG), a consolidated subsidiary owned 50 percent by the Corporation, will purchase for approximately $3.9 billion the Corporation's shares of a wholly-owned affiliate in Japan, ExxonMobil Yugen Kaisha, which will result in TG acquiring approximately 200 million of its shares currently owned by the Corporation along with other assets. As a result of the restructuring the Corporation's effective ownership of TG will be reduced to approximately 22 percent. Closing is anticipated in mid-2012. The major classes of assets and liabilities that would have been classified as held for sale if the transaction had met the criteria for held for sale accounting at December 31, 2011, were as follows:   (millions of dollars)   Assets   Current assets (1)   $ 6,862    Net property, plant and equipment     4,740    Other assets     1,757    Total assets   $ 13,359    Liabilities   Current liabilities   $ 8,450    Postretirement benefits reserves     2,103    Other long-term obligations     1,179    Total liabilities   $ 11,732    Equity   ExxonMobil share of equity (2)   $ (467 )  Noncontrolling interests     2,094    Total equity   $ 1,627    Total liabilities and equity   $ 13,359      (1) Current assets include $1,882 million of crude oil, products and merchandise inventory.   (2) On the date the Corporation transfers control to TG, the ExxonMobil share of accumulated other comprehensive income will be recycled as a benefit to earnings. At December 31, 2011, the total accumulated other comprehensive income was $1,482 million.

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Summary Of Accounting Policies (Policy)	12 Months Ended
Dec. 31, 2011
Summary Of Accounting Policies [Abstract]
Principles Of Consolidation	Principles of Consolidation. The Consolidated Financial Statements include the accounts of subsidiaries the Corporation controls. They also include the Corporation's share of the undivided interest in certain upstream assets and liabilities. Amounts representing the Corporation's percentage interest in the underlying net assets of entities that it does not control, but over which it exercises significant influence, are included in "Investments, advances and long-term receivables". The Corporation's share of the net income of these companies is included in the Consolidated Statement of Income caption "Income from equity affiliates." Majority ownership is normally the indicator of control that is the basis on which subsidiaries are consolidated. However, certain factors may indicate that a majority-owned investment is not controlled and therefore should be accounted for using the equity method of accounting. These factors occur where the minority shareholders are granted by law or by contract substantive participating rights. These include the right to approve operating policies, expense budgets, financing and investment plans, and management compensation and succession plans. The Corporation's share of the cumulative foreign exchange translation adjustment for equity method investments is reported in the Consolidated Statement of Changes in Equity. Evidence of loss in value that might indicate impairment of investments in companies accounted for on the equity method is assessed to determine if such evidence represents a loss in value of the Corporation's investment that is other than temporary. Examples of key indicators include a history of operating losses, a negative earnings and cash flow outlook, significant downward revisions to oil and gas reserves, and the financial condition and prospects for the investee's business segment or geographic region. If evidence of an other than temporary loss in fair value below carrying amount is determined, an impairment is recognized. In the absence of market prices for the investment, discounted cash flows are used to assess fair value.
Revenue Recognition	Revenue Recognition. The Corporation generally sells crude oil, natural gas and petroleum and chemical products under short-term agreements at prevailing market prices. In some cases (e.g., natural gas), products may be sold under long-term agreements, with periodic price adjustments. Revenues are recognized when the products are delivered, which occurs when the customer has taken title and has assumed the risks and rewards of ownership, prices are fixed or determinable and collectibility is reasonably assured. Revenues from the production of natural gas properties in which the Corporation has an interest with other producers are recognized on the basis of the Corporation's net working interest. Differences between actual production and net working interest volumes are not significant. Purchases and sales of inventory with the same counterparty that are entered into in contemplation of one another are combined and recorded as exchanges measured at the book value of the item sold.
Sales-Based Taxes	Sales-Based Taxes. The Corporation reports sales, excise and value-added taxes on sales transactions on a gross basis in the Consolidated Statement of Income (included in both revenues and costs).
Derivative Instruments	Derivative Instruments. The Corporation makes limited use of derivative instruments. The Corporation does not engage in speculative derivative activities or derivative trading activities, nor does it use derivatives with leveraged features. When the Corporation does enter into derivative transactions, it is to offset exposures associated with interest rates, foreign currency exchange rates and hydrocarbon prices that arise from existing assets, liabilities and forecasted transactions. The gains and losses resulting from changes in the fair value of derivatives are recorded in income. In some cases, the Corporation designates derivatives as fair value hedges, in which case the gains and losses are offset in income by the gains and losses arising from changes in the fair value of the underlying hedged item.
Fair Value	Fair Value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Hierarchy Levels 1, 2 and 3 are terms for the priority of inputs to valuation techniques used to measure fair value. Hierarchy Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Hierarchy Level 2 inputs are inputs other than quoted prices included within Level 1 that are directly or indirectly observable for the asset or liability. Hierarchy Level 3 inputs are inputs that are not observable in the market.
Inventories	Inventories. Crude oil, products and merchandise inventories are carried at the lower of current market value or cost (generally determined under the last-in, first-out method – LIFO). Inventory costs include expenditures and other charges (including depreciation) directly and indirectly incurred in bringing the inventory to its existing condition and location. Selling expenses and general and administrative expenses are reported as period costs and excluded from inventory cost. Inventories of materials and supplies are valued at cost or less.
Property, Plant And Equipment	Property, Plant and Equipment. Depreciation, depletion and amortization, based on cost less estimated salvage value of the asset, are primarily determined under either the unit-of-production method or the straight-line method, which is based on estimated asset service life taking obsolescence into consideration. Maintenance and repairs, including planned major maintenance, are expensed as incurred. Major renewals and improvements are capitalized and the assets replaced are retired. Interest costs incurred to finance expenditures during the construction phase of multiyear projects are capitalized as part of the historical cost of acquiring the constructed assets. The project construction phase commences with the development of the detailed engineering design and ends when the constructed assets are ready for their intended use. Capitalized interest costs are included in property, plant and equipment and are depreciated over the service life of the related assets. The Corporation uses the "successful efforts" method to account for its exploration and production activities. Under this method, costs are accumulated on a field-by-field basis with certain exploratory expenditures and exploratory dry holes being expensed as incurred. Costs of productive wells and development dry holes are capitalized and amortized on the unit-of-production method. The Corporation carries as an asset exploratory well costs when the well has found a sufficient quantity of reserves to justify its completion as a producing well and where the Corporation is making sufficient progress assessing the reserves and the economic and operating viability of the project. Exploratory well costs not meeting these criteria are charged to expense. Other exploratory expenditures, including geophysical costs and annual lease rentals, are expensed as incurred. Acquisition costs of proved properties are amortized using a unit-of-production method, computed on the basis of total proved oil and gas reserves. Capitalized exploratory drilling and development costs associated with productive depletable extractive properties are amortized using unit-of-production rates based on the amount of proved developed reserves of oil, gas and other minerals that are estimated to be recoverable from existing facilities using current operating methods. Under the unit-of-production method, oil and gas volumes are considered produced once they have been measured through meters at custody transfer or sales transaction points at the outlet valve on the lease or field storage tank. Production costs are expensed as incurred. Production involves lifting the oil and gas to the surface and gathering, treating, field processing and field storage of the oil and gas. The production function normally terminates at the outlet valve on the lease or field production storage tank. Production costs are those incurred to operate and maintain the Corporation's wells and related equipment and facilities. They become part of the cost of oil and gas produced. These costs, sometimes referred to as lifting costs, include such items as labor costs to operate the wells and related equipment; repair and maintenance costs on the wells and equipment; materials, supplies and energy costs required to operate the wells and related equipment; and administrative expenses related to the production activity. Proved oil and gas properties held and used by the Corporation are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amounts may not be recoverable. Assets are grouped at the lowest level for which there are identifiable cash flows that are largely independent of the cash flows of other groups of assets. The Corporation estimates the future undiscounted cash flows of the affected properties to judge the recoverability of carrying amounts. Cash flows used in impairment evaluations are developed using annually updated corporate plan investment evaluation assumptions for crude oil commodity prices and foreign currency exchange rates. Annual volumes are based on field production profiles, which are also updated annually. Prices for natural gas and other products are based on corporate plan assumptions developed annually by major region and also for investment evaluation purposes. Cash flow estimates for impairment testing exclude derivative instruments. Impairment analyses are generally based on proved reserves. Where probable reserves exist, an appropriately risk-adjusted amount of these reserves may be included in the impairment evaluation. Impairments are measured by the amount the carrying value exceeds the fair value. Significant unproved properties are assessed for impairment individually, and valuation allowances against the capitalized costs are recorded based on the estimated economic chance of success and the length of time that the Corporation expects to hold the properties. Properties that are not individually significant are aggregated by groups and amortized based on development risk and average holding period. The valuation allowances are reviewed at least annually. Gains on sales of proved and unproved properties are only recognized when there is no uncertainty about the recovery of costs applicable to any interest retained or where there is no substantial obligation for future performance by the Corporation. Losses on properties sold are recognized when incurred or when the properties are held for sale and the fair value of the properties is less than the carrying value.
Asset Retirement Obligations And Environmental Liabilities	Asset Retirement Obligations and Environmental Liabilities. The Corporation incurs retirement obligations for certain assets at the time they are installed. The fair values of these obligations are recorded as liabilities on a discounted basis. The costs associated with these liabilities are capitalized as part of the related assets and depreciated. Over time, the liabilities are accreted for the change in their present value. Liabilities for environmental costs are recorded when it is probable that obligations have been incurred and the amounts can be reasonably estimated. These liabilities are not reduced by possible recoveries from third parties and projected cash expenditures are not discounted.
Foreign Currency Translation	Foreign Currency Translation. The Corporation selects the functional reporting currency for its international subsidiaries based on the currency of the primary economic environment in which each subsidiary operates. Downstream and Chemical operations primarily use the local currency. However, the U.S. dollar is used in countries with a history of high inflation (primarily in Latin America) and Singapore, which predominantly sells into the U.S. dollar export market. Upstream operations which are relatively self-contained and integrated within a particular country, such as Canada, the United Kingdom, Norway and continental Europe, use the local currency. Some Upstream operations, primarily in Asia and Africa, use the U.S. dollar because they predominantly sell crude and natural gas production into U.S. dollar-denominated markets. For all operations, gains or losses from remeasuring foreign currency transactions into the functional currency are included in income.
Stock-Based Payments	Stock-Based Payments. The Corporation awards stock-based compensation to employees in the form of restricted stock and restricted stock units. Compensation expense is measured by the market price of the restricted shares at the date of grant and is recognized in the income statement over the requisite service period of each award. See Note 14, Incentive Program, for further details.

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Miscellaneous Financial Information (Tables)	12 Months Ended
Dec. 31, 2011
Miscellaneous Financial Information [Abstract]
Crude Oil, Products And Merchandise	2011        2010       (billions of dollars)   Petroleum products   $ 4.1         $ 3.5    Crude oil     4.8           3.8    Chemical products     2.3           2.1    Gas/other     0.5           0.5    Total   $ 11.7         $ 9.9

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Cash Flow Information (Tables)	12 Months Ended
Dec. 31, 2011
Cash Flow Information [Abstract]
Cash payments for interest and income taxes	2011        2010        2009       (millions of dollars)   Cash payments for interest   $ 557         $ 703         $ 820    Cash payments for income taxes   $ 27,254         $ 18,941         $ 15,427

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Additional Working Capital Information (Tables)	12 Months Ended
Dec. 31, 2011
Additional Working Capital Information [Abstract]
Schedule Of Notes, Accounts Receivable And Payable, Loans Payable, And Accrued Liabilities	Dec. 31 2011        Dec. 31 2010       (millions of dollars)   Notes and accounts receivable        Trade, less reserves of $128 million and $152 million   $ 30,044         $ 25,439    Other, less reserves of $39 million and $34 million     8,598           6,845    Total   $ 38,642         $ 32,284    Notes and loans payable        Bank loans   $ 1,237         $ 532    Commercial paper     2,281           1,346    Long-term debt due within one year     3,431           345    Other     762           564    Total   $ 7,711         $ 2,787    Accounts payable and accrued liabilities        Trade payables   $ 33,969         $ 30,780    Payables to equity companies     5,553           5,450    Accrued taxes other than income taxes     7,123           6,778    Other     10,422           7,026    Total   $ 57,067         $ 50,034

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Equity Company Information (Tables)	12 Months Ended
Dec. 31, 2011
Equity Company Information [Abstract]
Schedule Of Equity Company Financial Summary	2011      2010      2009   Equity Company Financial Summary    Total      ExxonMobil Share      Total      ExxonMobil Share      Total      ExxonMobil Share        (millions of dollars)   Total revenues    $ 204,635       $ 65,147       $ 153,020       $ 48,355       $ 112,153       $ 36,570    Income before income taxes    $ 68,908       $ 20,892       $ 48,075       $ 14,735       $ 28,472       $ 9,632    Income taxes      19,812         5,603         13,962         4,058         7,775         2,489    Income from equity affiliates    $ 49,096       $ 15,289       $ 34,113       $ 10,677       $ 20,697       $ 7,143                      Current assets    $ 52,879       $ 17,317       $ 48,573       $ 15,860       $ 37,376       $ 12,843    Long-term assets      96,908         30,833         90,646         29,805         88,153         27,983    Total assets    $ 149,787       $ 48,150       $ 139,219       $ 45,665       $ 125,529       $ 40,826    Current liabilities    $ 41,016       $ 12,454       $ 33,160       $ 10,260       $ 24,854       $ 8,085    Long-term liabilities      62,472         18,728         59,596         17,976         57,384         16,999    Net assets    $ 46,299       $ 16,968       $ 46,463       $ 17,429       $ 43,291       $ 15,742
Schedule Of The Corporation's Percentage Ownership Interest	Percentage Ownership Interest   Upstream   Aera Energy LLC     48    BEB Erdgas und Erdoel GmbH     50    Cameroon Oil Transportation Company S.A.     41    Castle Peak Power Company Limited     60    Golden Pass LNG Terminal LLC     18    Nederlandse Aardolie Maatschappij B.V.     50    Qatar Liquefied Gas Company Limited     10    Qatar Liquefied Gas Company Limited 2     24    Ras Laffan Liquefied Natural Gas Company Limited     25    Ras Laffan Liquefied Natural Gas Company Limited II     31    Ras Laffan Liquefied Natural Gas Company Limited (3)     30    South Hook LNG Terminal Company Limited     24    Tengizchevroil, LLP     25    Terminale GNL Adriatico S.r.l.     71    Downstream   Chalmette Refining, LLC     50    Fujian Refining & Petrochemical Co. Ltd.     25    Saudi Aramco Mobil Refinery Company Ltd.     50    Chemical   Al-Jubail Petrochemical Company     50    Infineum Holdings B.V.     50    Saudi Yanbu Petrochemical Co.     50    Toray Tonen Specialty Separator Godo Kaisha     50

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Investments, Advances And Long-Term Receivables (Tables)	12 Months Ended
Dec. 31, 2011
Investments, Advances And Long-Term Receivables [Abstract]
Schedule Of Investments, Advances And Long-Term Receivables	Dec. 31, 2011        Dec. 31, 2010          (millions of dollars)   Companies carried at equity in underlying assets           Investments      $ 16,968         $ 17,429    Advances        9,740           9,286    Total equity company investments and advances      $ 26,708         $ 26,715    Companies carried at cost or less and stock investments carried at fair value        1,544           1,557    Long-term receivables and miscellaneous investments at cost or less, net of reserves of $469 million and $292 million        6,081           7,066    Total      $ 34,333         $ 35,338

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Property, Plant And Equipment And Asset Retirement Obligations (Tables)	12 Months Ended
Dec. 31, 2011
Property, Plant And Equipment And Asset Retirement Obligations [Abstract]
Property, Plant And Equipment	Dec. 31, 2011        Dec. 31, 2010   Property, Plant and Equipment   Cost        Net        Cost        Net       (millions of dollars)   Upstream   $ 283,710         $ 163,975         $ 264,136         $ 148,152    Downstream     67,900           28,801           68,652           30,095    Chemical     30,405           14,469           29,524           14,255    Other     11,980           7,419           11,626           7,046    Total   $ 393,995         $ 214,664         $ 373,938         $ 199,548
Asset Retirement Obligations	2011      2010       (millions of dollars)   Beginning balance   $ 9,614       $ 8,473    Accretion expense and other provisions     581         563    Reduction due to property sales     (854 )       (183 )  Payments made     (662 )       (638 )  Liabilities incurred     117         1,094    Foreign currency translation     (62 )       (45 )  Revisions     1,844         350    Ending balance   $ 10,578       $ 9,614

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Accounting For Suspended Exploratory Well Costs (Tables)	12 Months Ended
Dec. 31, 2011
Accounting For Suspended Exploratory Well Costs [Abstract]
Change In Capitalized Suspended Exploratory Well Costs	2011      2010      2009       (millions of dollars)   Balance beginning at January 1   $ 2,893       $ 2,005       $ 1,585    Additions pending the determination of proved reserves     310         1,103         624    Charged to expense     (213 )       (104 )       (51 )  Reclassifications to wells, facilities and equipment based on the determination of proved reserves     (149 )       (136 )       (200 )  Other     40         25         47    Ending balance   $ 2,881       $ 2,893       $ 2,005    Ending balance attributed to equity companies included above   $ –       $ –       $ 9
Period End Capitalized Suspended Exploratory Well Costs	2011        2010        2009       (millions of dollars)   Capitalized for a period of one year or less   $ 310         $ 1,103         $ 624    Capitalized for a period of between one and five years     1,922           1,294           924    Capitalized for a period of between five and ten years     409           278           220    Capitalized for a period of greater than ten years     240           218           237    Capitalized for a period greater than one year – subtotal   $ 2,571         $ 1,790         $ 1,381    Total   $ 2,881         $ 2,893         $ 2,005
Number Of Projects With Suspended Exploratory Wells Costs	2011        2010        2009   Number of projects with first capitalized well drilled in the preceding 12 months              4                    9                 18    Number of projects that have exploratory well costs capitalized for a period of greater than 12 months            58                  59                 57    Total            62                  68                 75
Additional Detail For The 32 Projects With Completed Exploratory Activity Progressing Toward Development	Country/Project   Dec. 31, 2011     Years Wells Drilled   Comment                              (millions of dollars)      Angola                 – Perpetua-Zina-Acacia   $ 15      2008 - 2009   Oil field near Pazflor development, awaiting capacity in existing/planned infrastructure. Australia                 – East Pilchard     10      2001   Gas field near Kipper/Tuna development, awaiting capacity in existing/planned infrastructure. – SE Longtom     15      2010   Gas field near Tuna development, awaiting capacity in existing/planned infrastructure. Indonesia                 – Natuna     118      1981 - 1983   Development activity under way, while continuing discussions with the government on contract terms pursuant to executed Heads of Agreement. Kazakhstan                 – Kairan     53      2004 - 2007   Declarations involving field commerciality filed with Kazakhstan government in 2008; progressing commercialization and field development studies. Malaysia                 – Besar     18      1992 - 2010   Gas field off the east coast of Malaysia; progressing development plan. – Other (2 projects)     8      1979 - 1995   Projects primarily awaiting capacity in existing or planned infrastructure. Nigeria                 – Bolia     15      2002 - 2006   Evaluating development plan, while continuing discussions with the government regarding regional hub strategy. – Bosi     79      2002 - 2006   Development activity under way, while continuing discussions with the government regarding development plan. – Pegi     32      2009   Awaiting capacity in existing/planned infrastructure – Other (4 projects)     13      2002   Pursuing development of several additional offshore satellite discoveries which will tie back to existing/planned production facilities. Norway                 – Gamma     20      2008 - 2009   Evaluating development plan for tieback to existing production facilities. – H-North     15      2007   Discovery near existing facilities in Fram area; progressing development plans. – Lavrans     22      1995 - 1999   Development awaiting capacity in existing Kristin production facility; evaluating development concepts for phased ullage scenarios. – Nyk High     19      2008   Evaluating field development alternatives. – Other (6 projects)     26      1992 - 2010   Evaluating development plans, including potential for tieback to existing production facilities. Papua New Guinea                 – Juha     28      2007   Working on development plans to tie into planned LNG facilities. United Kingdom                 – Fram     55      2009   Progressing development and commercialization plans. – Other (2 projects)     14      2001 - 2004   Projects primarily awaiting capacity in existing or planned infrastructure. United States                 – Julia Unit     78      2007 - 2008   Reached agreement with the Department of Interior and Department of Justice providing for suspension of production; progressing development plans with partners. – Point Thomson     449      1977 - 2010   Continuing discussions with government and partners on development plan. – Tip Top     31      2009   Evaluating development concept and requisite facility upgrades. Total 2011 (32 projects)   $ 1,133

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Leased Facilities (Tables)	12 Months Ended
Dec. 31, 2011
Leased Facilities [Abstract]
Leased Facilities	Lease Payments Under Minimum Commitments        Related Sublease Rental Income       (millions of dollars)   2012   $ 2,152         $ 18    2013     1,696           17    2014     1,219           15    2015     802           12    2016     415           10    2017 and beyond     1,630           35    Total   $ 7,914         $ 107
Net Rental Cost	2011        2010        2009       (millions of dollars)   Rental cost   $ 4,061         $ 3,762         $ 4,426    Less sublease rental income     74           90           98    Net rental cost   $ 3,987         $ 3,672         $ 4,328

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Earnings Per Share (Tables)	12 Months Ended
Dec. 31, 2011
Earnings Per Share [Abstract]
Earnings Per Share Computation	2011        2010        2009   Earnings per common share             Net income attributable to ExxonMobil (millions of dollars)   $ 41,060         $ 30,460         $ 19,280    Weighted average number of common shares outstanding (millions of shares)     4,870           4,885           4,832    Earnings per common share (dollars)   $ 8.43         $ 6.24         $ 3.99    Earnings per common share – assuming dilution             Net income attributable to ExxonMobil (millions of dollars)   $ 41,060         $ 30,460         $ 19,280    Weighted average number of common shares outstanding (millions of shares)     4,870           4,885           4,832    Effect of employee stock-based awards     5           12           16    Weighted average number of common shares outstanding – assuming dilution     4,875           4,897           4,848    Earnings per common share – assuming dilution (dollars)   $ 8.42         $ 6.22         $ 3.98    Dividends paid per common share (dollars)   $ 1.85         $ 1.74         $ 1.66

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Long-Term Debt (Tables)	12 Months Ended
Dec. 31, 2011
Long-Term Debt [Abstract]
Summarized Long-Term Debt	2011        2010       (millions of dollars)   SeaRiver Maritime Financial Holdings, Inc. (1)   Guaranteed deferred interest debentures due 2012        – Face value net of unamortized discount plus accrued interest   $ —         $ 2,389    XTO Energy Inc. (2)        7.500% senior note due 2012     —           199    5.900% senior note due 2012     —           233    6.250% senior note due 2013     185           193    4.625% senior note due 2013     145           149    5.750% senior note due 2013     346           359    4.900% senior note due 2014     260           267    5.000% senior note due 2015     138           142    5.300% senior note due 2015     255           262    5.650% senior note due 2016     222           227    6.250% senior note due 2017     513           534    5.500% senior note due 2018     402           420    6.500% senior note due 2018     506           524    6.100% senior note due 2036     203           204    6.750% senior note due 2037     317           329    6.375% senior note due 2038     241           258    Mobil Services (Bahamas) Ltd.        Variable note due 2035 (3)     972           972    Variable note due 2034 (4)     311           311    Mobil Producing Nigeria Unlimited (5)        Variable notes due 2012-2017     543           415    Esso (Thailand) Public Company Ltd. (6)        Variable notes due 2012-2017     413           522    Mobil Corporation        8.625% debentures due 2021     248           248    Industrial revenue bonds due 2012-2051 (7)     2,315           2,247    Other U.S. dollar obligations (8)     496           454    Other foreign currency obligations     31           65    Capitalized lease obligations (9)     260           304    Total long-term debt   $ 9,322         $ 12,227      (1) Additional information is provided for this subsidiary on the following pages.   (2) Includes premiums of $421 million.   (3) Average effective interest rate of 0.2% in 2011 and 0.3% in 2010.   (4) Average effective interest rate of 0.3% in 2011 and 0.4% in 2010.   (5) Average effective interest rate of 4.2% in 2011 and 4.6% in 2010.   (6) Average effective interest rate of 3.2% in 2011 and 1.7% in 2010.   (7) Average effective interest rate of 0.1% in 2011 and 0.2% in 2010.   (8) Average effective interest rate of 4.8% in 2011 and 4.7% in 2010.   (9) Average imputed interest rate of 8.5% in 2011 and 8.1% in 2010.
Condensed Consolidated Statement Of Income	Consolidating Consolidating Consolidating Consolidating Consolidating      Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated statement of income for 12 months ended December 31, 2011   Revenues and other income               Sales and other operating revenue, including sales-based taxes   $ 17,942       $ –       $ 449,087       $ –       $ 467,029    Income from equity affiliates     39,198         (14 )       15,196         (39,091 )       15,289    Other income     472         –         3,639         –         4,111    Intercompany revenue     54,891         3         451,627         (506,521 )       –    Total revenues and other income     112,503         (11 )       919,549         (545,612 )       486,429    Costs and other deductions               Crude oil and product purchases     57,604         –         704,125         (495,195 )       266,534    Production and manufacturing expenses     7,827         –         38,234         (5,793 )       40,268    Selling, general and administrative expenses     2,936         –         12,748         (701 )       14,983    Depreciation and depletion     1,660         –         13,923         –         15,583    Exploration expenses, including dry holes     219         –         1,862         –         2,081    Interest expense     305         274         4,512         (4,844 )       247    Sales-based taxes     –         –         33,503         –         33,503    Other taxes and duties     40         –         39,933         –         39,973    Total costs and other deductions     70,591         274         848,840         (506,533 )       413,172    Income before income taxes     41,912         (285 )       70,709         (39,079 )       73,257    Income taxes     852         (101 )       30,300         –         31,051    Net income including noncontrolling interests     41,060         (184 )       40,409         (39,079 )       42,206    Net income attributable to noncontrolling interests     –         –         1,146         –         1,146    Net income attributable to ExxonMobil   $ 41,060       $   (184)       $ 39,263       $ (39,079 )     $ 41,060         Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated statement of income for 12 months ended December 31, 2010   Revenues and other income               Sales and other operating revenue, including sales-based taxes   $ 15,382       $ –       $ 354,743       $ –       $ 370,125    Income from equity affiliates     28,401         (2 )       10,589         (28,311 )       10,677    Other income     790         –         1,629         –         2,419    Intercompany revenue     39,433         4         332,483         (371,920 )       –    Total revenues and other income     84,006         2         699,444         (400,231 )       383,221    Costs and other deductions               Crude oil and product purchases     40,788         –         518,961         (361,790 )       197,959    Production and manufacturing expenses     7,627         –         33,400         (5,235 )       35,792    Selling, general and administrative expenses     2,871         –         12,482         (670 )       14,683    Depreciation and depletion     1,761         –         12,999         –         14,760    Exploration expenses, including dry holes     251         –         1,893         –         2,144    Interest expense     217         246         4,035         (4,239 )       259    Sales-based taxes     –         –         28,547         –         28,547    Other taxes and duties     29         –         36,089         –         36,118    Total costs and other deductions     53,544         246         648,406         (371,934 )       330,262    Income before income taxes     30,462         (244 )       51,038         (28,297 )       52,959    Income taxes     2         (90 )       21,649         –         21,561    Net income including noncontrolling interests     30,460         (154 )       29,389         (28,297 )       31,398    Net income attributable to noncontrolling interests     –         –         938         –         938    Net income attributable to ExxonMobil   $ 30,460       $ (154 )     $ 28,451       $ (28,297 )     $ 30,460    Condensed consolidated statement of income for 12 months ended December 31, 2009   Revenues and other income               Sales and other operating revenue, including sales-based taxes   $ 11,352       $ –       $ 290,148       $ –       $ 301,500    Income from equity affiliates     19,852         7         7,060         (19,776 )       7,143    Other income     813         –         1,130         –         1,943    Intercompany revenue     30,889         4         271,663         (302,556 )       –    Total revenues and other income     62,906         11         570,001         (322,332 )       310,586    Costs and other deductions               Crude oil and product purchases     31,419         –         411,689         (290,302 )       152,806    Production and manufacturing expenses     7,811         –         30,805         (5,589 )       33,027    Selling, general and administrative expenses     2,574         –         12,852         (691 )       14,735    Depreciation and depletion     1,571         –         10,346         –         11,917    Exploration expenses, including dry holes     230         –         1,791         –         2,021    Interest expense     1,200         222         5,126         (6,000 )       548    Sales-based taxes     –         –         25,936         –         25,936    Other taxes and duties     (29 )       –         34,848         –         34,819    Total costs and other deductions     44,776         222         533,393         (302,582 )       275,809    Income before income taxes     18,130         (211 )       36,608         (19,750 )       34,777    Income taxes     (1,150 )       (81 )       16,350         –         15,119    Net income including noncontrolling interests     19,280         (130 )       20,258         (19,750 )       19,658    Net income attributable to noncontrolling interests     –         –         378         –         378    Net income attributable to ExxonMobil   $ 19,280       $     (130 )     $ 19,880       $ (19,750 )     $ 19,280
Condensed Consolidated Balance Sheet	Consolidating Consolidating Consolidating Consolidating Consolidating      Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated balance sheet for year ended December 31, 2011   Cash and cash equivalents   $ 1,354       $ –       $ 11,310       $ –       $ 12,664    Cash and cash equivalents – restricted     239         –         165         –         404    Notes and accounts receivable – net     2,719         –         36,569         (646 )       38,642    Inventories     1,634         –         13,390         –         15,024    Other current assets     353         –         5,876         –         6,229    Total current assets     6,299         –         67,310         (646 )       72,963    Investments and other assets     260,410         393         485,157         (702,535 )       43,425    Property, plant and equipment – net     19,687         –         194,977         –         214,664    Intercompany receivables     17,325         2,726         543,844         (563,895 )       —    Total assets   $ 303,721       $ 3,119       $ 1,291,288       $ (1,267,076 )     $ 331,052    Notes and loans payable   $ 1,851       $ 2,662       $ 3,198       $ –       $ 7,711    Accounts payable and accrued liabilities     3,117         57         53,893         –         57,067    Income taxes payable     –         2         13,371         (646 )       12,727    Total current liabilities     4,968         2,721         70,462         (646 )       77,505    Long-term debt     293         –         9,029         –         9,322    Postretirement benefits reserves     12,344         –         12,650         –         24,994    Deferred income tax liabilities     1,450         –         35,168         –         36,618    Other long-term liabilities     5,215         –         16,654         –         21,869    Intercompany payables     125,055         386         438,454         (563,895 )       –    Total liabilities     149,325         3,107         582,417         (564,541 )       170,308    Earnings reinvested     330,939         (1,032 )       141,467         (140,435 )       330,939    Other equity     (176,543 )       1,044         561,056         (562,100 )       (176,543 )  ExxonMobil share of equity     154,396         12         702,523         (702,535 )       154,396    Noncontrolling interests     –         –         6,348         –         6,348    Total equity     154,396         12         708,871         (702,535 )       160,744    Total liabilities and equity   $ 303,721       $ 3,119       $ 1,291,288       $ (1,267,076 )     $ 331,052         Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated balance sheet for year ended December 31, 2010   Cash and cash equivalents   $ 309       $ –       $ 7,516       $ –       $ 7,825    Cash and cash equivalents – restricted     371         –         257         –         628    Notes and accounts receivable – net     2,104         –         30,346         (166 )       32,284    Inventories     1,457         –         11,519         –         12,976    Other current assets     239         –         5,032         –         5,271    Total current assets     4,480         –         54,670         (166 )       58,984    Investments and other assets     255,005         458         462,893         (674,378 )       43,978    Property, plant and equipment – net     18,830         –         180,718         –         199,548    Intercompany receivables     18,186         2,457         528,405         (549,048 )       –    Total assets   $ 296,501       $ 2,915       $ 1,226,686       $ (1,223,592 )     $ 302,510    Notes and loans payable   $ 1,042       $ 13       $ 1,732       $ –       $ 2,787    Accounts payable and accrued liabilities     2,987         –         47,047         –         50,034    Income taxes payable     –         3         9,975         (166 )       9,812    Total current liabilities     4,029         16         58,754         (166 )       62,633    Long-term debt     295         2,389         9,543         –         12,227    Postretirement benefits reserves     9,660         –         9,707         –         19,367    Deferred income tax liabilities     642         107         34,401         –         35,150    Other long-term liabilities     5,632         –         14,822         –         20,454    Intercompany payables     129,404         382         419,262         (549,048 )       –    Total liabilities     149,662         2,894         546,489         (549,214 )       149,831    Earnings reinvested     298,899         (848 )       132,357         (131,509 )       298,899    Other equity     (152,060 )       869         542,000         (542,869 )       (152,060 )  ExxonMobil share of equity     146,839         21         674,357         (674,378 )       146,839    Noncontrolling interests     –         –         5,840         –         5,840    Total equity     146,839         21         680,197         (674,378 )       152,679    Total liabilities and equity   $ 296,501       $   2,915       $ 1,226,686       $ (1,223,592 )     $ 302,510
Condensed Consolidated Statement Of Cash Flows	Consolidating Consolidating Consolidating Consolidating Consolidating      Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated statement of cash flows for 12 months ended December 31, 2011   Cash provided by/(used in) operating activities   $ 37,752       $ 63       $ 47,683       $ (30,153 )     $ 55,345    Cash flows from investing activities               Additions to property, plant and equipment     (2,516 )       –         (28,459 )       –         (30,975 )  Proceeds associated with sales of long-term assets     667         –         10,466         –         11,133    Decrease/(increase) in restricted cash and cash equivalents     132         –         92         –         224    Net intercompany investing     (4,227 )       (229 )       4,015         441         –    All other investing, net     (1,679 )       –         (868 )       –         (2,547 )  Net cash provided by/(used in) investing activities     (7,623 )       (229 )       (14,754 )       441         (22,165 )  Cash flows from financing activities               Additions to short- and long-term debt     –         –         1,765         –         1,765    Reductions in short- and long-term debt     (2 )       (13 )       (1,354 )       –         (1,369 )  Additions/(reductions) in debt with three months or less maturity     809         –         752         –         1,561    Cash dividends     (9,020 )       –         (30,153 )       30,153         (9,020 )  Common stock acquired     (22,055 )       –         –         –         (22,055 )  Net intercompany financing activity     –         4         262         (266 )       –    All other financing, net     1,184         175         (322 )       (175 )       862    Net cash provided by/(used in) financing activities     (29,084 )       166         (29,050 )       29,712         (28,256 )  Effects of exchange rate changes on cash     –         –         (85 )       –         (85 )  Increase/(decrease) in cash and cash equivalents   $ 1,045       $ –       $ 3,794       $ –       $ 4,839    Condensed consolidated statement of cash flows for 12 months ended December 31, 2010   Cash provided by/(used in) operating activities   $ 35,740       $ 63       $ 18,307       $ (5,697 )     $ 48,413    Cash flows from investing activities               Additions to property, plant and equipment     (2,922 )       –         (23,949 )       –         (26,871 )  Proceeds associated with sales of long-term assets     1,484         –         1,777         –         3,261    Decrease/(increase) in restricted cash and cash equivalents     (371 )       –         (257 )       –         (628 )  Net intercompany investing     (13,966 )       (200 )       13,813         353         –    All other investing, net     (672 )       –         706         –         34    Net cash provided by/(used in) investing activities     (16,447 )       (200 )       (7,910 )       353         (24,204 )  Cash flows from financing activities               Additions to short- and long-term debt     –         –         1,741         –         1,741    Reductions in short- and long-term debt     (3 )       (13 )       (8,644 )       –         (8,660 )  Additions/(reductions) in debt with three months or less maturity     997         –         (288 )       –         709    Cash dividends     (8,498 )       –         (5,697 )       5,697         (8,498 )  Common stock acquired     (13,093 )       –         –         –         (13,093 )  Net intercompany financing activity     –         –         202         (202 )       –    All other financing, net     1,164         150         (286 )       (151 )       877    Net cash provided by/(used in) financing activities     (19,433 )       137         (12,972 )       5,344         (26,924 )  Effects of exchange rate changes on cash     –         –         (153 )       –         (153 )  Increase/(decrease) in cash and cash equivalents   $ (140 )     $ –       $ (2,728 )     $ –       $ (2,868 )      Consolidating Consolidating Consolidating Consolidating Consolidating      Exxon Mobil Corporation Parent Guarantor      SeaRiver Maritime Financial Holdings, Inc.      All Other Subsidiaries      Consolidating and Eliminating Adjustments      Consolidated       (millions of dollars)   Condensed consolidated statement of cash flows for 12 months ended December 31, 2009   Cash provided by/(used in) operating activities   $ 27,424       $ 72       $ 28,024       $ (27,082 )     $ 28,438    Cash flows from investing activities               Additions to property, plant and equipment     (2,686 )       –         (19,805 )       –         (22,491 )  Proceeds associated with sales of long-term assets     228         –         1,317         –         1,545    Decrease/(increase) in restricted cash and cash equivalents     –         –         –         –         –    Net intercompany investing     (1,826 )       (209 )       1,717         318         –    All other investing, net     –         –         (1,473 )       –         (1,473 )  Net cash provided by/(used in) investing activities     (4,284 )       (209 )       (18,244 )       318         (22,419 )  Cash flows from financing activities               Additions to short- and long-term debt     –         –         1,561         –         1,561    Reductions in short- and long-term debt     (3 )       (13 )       (1,627 )       –         (1,643 )  Additions/(reductions) in debt with three months or less maturity     39         –         (110 )       –         (71 )  Cash dividends     (8,023 )       –         (27,082 )       27,082         (8,023 )  Common stock acquired     (19,703 )       –         –         –         (19,703 )  Net intercompany financing activity     –         –         168         (168 )       –    All other financing, net     988         150         (392 )       (150 )       596    Net cash provided by/(used in) financing activities     (26,702 )       137         (27,482 )       26,764         (27,283 )  Effects of exchange rate changes on cash     –         –         520         –         520    Increase/(decrease) in cash and cash equivalents   $ (3,562 )     $ –       $ (17,182 )     $ –       $ (20,744 )

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Incentive Program (Tables)	12 Months Ended
Dec. 31, 2011
Incentive Program [Abstract]
Summary Of Restricted Stock And Units Outstanding	2011   Restricted stock and units outstanding   Shares      Weighted Average Grant-Date Fair Value per Share       (thousands)          Issued and outstanding at January 1     47,306       $ 69.74    2010 award issued in 2011     10,639       $ 68.74    Vested     (10,628 )     $ 64.37    Forfeited     (536 )     $ 67.35    Issued and outstanding at December 31     46,781       $ 70.76
Grant Value Of Restricted Stock And Units	Value of restricted stock and units   2011        2010        2009   Grant price   $ 79.52         $ 66.07         $ 75.40    Value at date of grant:           (millions of dollars)   Restricted stock and units settled in stock   $ 766         $ 672         $ 711    Merger-related granted and converted XTO awards     –           250           –    Units settled in cash     72           60           53    Total value   $ 838         $ 982         $ 764
Summary Of Stock Options Outstanding	2011          Stock options   Shares      Avg. Exercise Price        Weighted Average Remaining Contractual Term     (thousands)                 Outstanding at January 1     29,509       $ 44.65         Exercised     (23,880 )     $ 38.81         Forfeited     (80 )     $ 48.01         Outstanding at December 31     5,549       $ 69.76         3.0 Years Exercisable at December 31     5,323       $ 68.65         3.0 Years

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Litigation And Other Contingencies (Tables)	12 Months Ended
Dec. 31, 2011
Litigation And Other Contingencies [Abstract]
Schedule Of Guarantees	Dec. 31, 2011        Equity Company Obligations(1)        Other Third-Party Obligations        Total       (millions of dollars)   Guarantees             Debt-related   $ 1,546         $ 65         $ 1,611    Other     3,061           3,784           6,845    Total   $ 4,607         $ 3,849         $ 8,456      (1) ExxonMobil share.
Unconditional Purchase Obligations	Payments Due by Period        2012     2013- 2016     2017 and Beyond     Total       (millions of dollars)   Unconditional purchase obligations (1)   $ 243      $ 660      $ 410      $ 1,313      (1) Undiscounted obligations of $1,313 million mainly pertain to pipeline throughput agreements and include $856 million of obligations to equity companies. The present value of these commitments, which excludes imputed interest of $229 million, totaled $1,084 million.

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Pension And Other Postretirement Benefits (Tables)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Pension And Other Postretirement Benefits [Abstract]
Change In Benefit Obligation Of Pension And Other Postretirement Benefits	Pension Benefits      Other Postretirement Benefits       U.S.      Non-U.S.           2011      2010      2011      2010      2011      2010       (percent)   Weighted-average assumptions used to determine benefit obligations at December 31                                                      Discount rate     5.00         5.50         4.00         4.80         5.00         5.50    Long-term rate of compensation increase     5.75         5.25         5.40         5.20         5.75         5.25            (millions of dollars)   Change in benefit obligation                                                      Benefit obligation at January 1   $ 15,007       $ 13,981       $ 25,722       $ 23,344       $ 7,331       $ 6,748    Service cost     546         468         574         480         121         101    Interest cost     792         798         1,267         1,175         393         395    Actuarial loss/(gain)     1,954         553         3,086         1,672         427         277    Benefits paid (1) (2)     (1,264 )       (873 )       (1,470 )       (1,281 )       (473 )       (394 )  Foreign exchange rate changes     –         –         (303 )       169         (11 )       26    Plan amendments, other     –         80         192         163         92         178    Benefit obligation at December 31   $ 17,035       $ 15,007       $ 29,068       $ 25,722       $ 7,880       $ 7,331    Accumulated benefit obligation at December 31   $ 14,081       $ 12,764       $ 25,480       $ 22,958       $ –       $ –      (1) Benefit payments for funded and unfunded plans.   (2) For 2011 and 2010, other postretirement benefits paid are net of $29 million and $15 million of Medicare subsidy receipts, respectively.
Change In Plan Assets Of Pension And Other Postretirement Benefits	Pension Benefits      Other Postretirement Benefits       U.S.      Non-U.S.           2011      2010      2011      2010      2011      2010       (millions of dollars)   Change in plan assets                                                      Fair value at January 1   $ 10,835       $ 10,277       $ 16,765       $ 15,401       $ 558       $ 514    Actual return on plan assets     505         1,235         123         1,482         –         63    Foreign exchange rate changes     –         –         (192 )       99         –         –    Company contribution     370         –         1,623         1,184         39         38    Benefits paid (1)     (1,054 )       (677 )       (1,046 )       (873 )       (59 )       (59 )  Other     –         –         (156 )       (528 )       –         2    Fair value at December 31   $ 10,656       $ 10,835       $ 17,117       $ 16,765       $ 538       $ 558      (1) Benefit payments for funded plans.
Summary Of Assets In Excess Of/(Less Than) Benefit Obligation	Pension Benefits       U.S.            Non-U.S.        2011      2010             2011      2010       (millions of dollars)   Assets in excess of/(less than) benefit obligation                                          Balance at December 31                                          Funded plans   $ (4,141 )     $ (2,349 )           $ (5,319 )     $ (2,769 )  Unfunded plans     (2,238 )       (1,823 )             (6,632 )       (6,188 )  Total   $ (6,379 )     $ (4,172 )           $ (11,951 )     $ (8,957 )
Amounts Recorded In Balance Sheet And Other Comprehensive Income	Pension Benefits            Other Postretirement Benefits       U.S.            Non-U.S.                 2011      2010             2011      2010             2011      2010       (millions of dollars)   Assets in excess of/(less than) benefit obligation         Balance at December 31 (1)   $ (6,379 )     $ (4,172 )           $ (11,951 )     $ (8,957 )           $ (7,342 )     $ (6,773 )                    Amounts recorded in the consolidated balance sheet consist of:                                                                  Other assets   $ 1       $ 1             $ 245       $ 400             $ –       $ –    Current liabilities     (237 )       (257 )             (346 )       (336 )             (341 )       (343 )  Postretirement benefits reserves     (6,143 )       (3,916 )             (11,850 )       (9,021 )             (7,001 )       (6,430 )  Total recorded   $ (6,379 )     $ (4,172 )           $ (11,951 )     $ (8,957 )           $ (7,342 )     $ (6,773 )                    Amounts recorded in accumulated other comprehensive income consist of:                                                                  Net actuarial loss/(gain)   $ 6,475       $ 5,028             $ 11,170       $ 7,795             $ 2,291       $ 1,985    Prior service cost     74         83               745         674               119         154    Total recorded in accumulated other comprehensive income   $ 6,549       $ 5,111             $ 11,915       $ 8,469             $ 2,410       $ 2,139      (1) Fair value of assets less benefit obligation shown on the preceding page.
Schedule Of Assumptions, Components Of Benefit Cost And Amounts Recorded In Accumulated Other Comprehensive Income For Pension And Other Postretirement Benefits	Pension Benefits         Other Postretirement Benefits       U.S.         Non-U.S.              2011     2010     2009          2011     2010     2009          2011     2010     2009   Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31     (percent)    Discount rate     5.50        6.00        6.25            4.80        5.20        5.50            5.50        6.00        6.25    Long-term rate of return on funded assets     7.50        7.50        8.00            6.80        6.70        7.30            7.50        7.50        8.00    Long-term rate of compensation increase     5.25        5.25        5.00            5.20        5.00        4.70            5.25        5.25        5.00        Components of net periodic benefit cost     (millions of dollars)    Service cost   $ 546      $ 468      $ 438          $ 574      $ 480      $ 421          $ 121      $ 101      $ 94    Interest cost     792        798        809            1,267        1,175        1,121            393        395        408    Expected return on plan assets     (769 )      (726 )      (656 )          (1,168 )      (1,010 )      (886 )          (41 )      (37 )      (35 )  Amortization of actuarial loss/(gain)     485        525        694            647        554        648            162        147        176    Amortization of prior service cost     9        2        –            103        84        79            35        52        69    Net pension enhancement and curtailment/settlement expense     286        321        485            34        9        2            –        –        –    Net periodic benefit cost   $ 1,349      $ 1,388      $ 1,770          $ 1,457      $ 1,292      $ 1,385          $ 670      $ 658      $ 712    Changes in amounts recorded in accumulated other comprehensive income:                                                                                 Net actuarial loss/(gain)   $ 2,218      $ 44      $ (231 )        $ 4,133      $ 1,202      $ (33 )        $ 468      $ 251      $ (107 )  Amortization of actuarial (loss)/gain     (771 )      (846 )      (1,179 )          (681 )      (563 )      (650 )          (162 )      (147 )      (176 )  Prior service cost/(credit)     –        80        –            187        160        69            –        26        –    Amortization of prior service (cost)/credit     (9 )      (2 )      –            (103 )      (84 )      (79 )          (35 )      (52 )      (69 )  Foreign exchange rate changes     –        –        –            (90 )      96        608            —        2        2    Total recorded in other comprehensive income     1,438        (724 )      (1,410 )          3,446        811        (85 )          271        80        (350 )  Total recorded in net periodic benefit cost and other comprehensive income, before tax   $ 2,787      $ 664      $ 360          $ 4,903      $ 2,103      $ 1,300          $ 941      $ 738      $ 362
Summary Of Change In Accumulated Other Comprehensive Income	Total Pension and Other Postretirement Benefits                2011                      2010                      2009           (Charge)/credit to other comprehensive income, before tax   (millions of dollars)   U.S. pension   $ (1,438 )     $ 724       $ 1,410    Non-U.S. pension     (3,446 )       (811 )       85    Other postretirement benefits     (271 )       (80 )       350    Total (charge)/credit to other comprehensive income, before tax     (5,155 )       (167 )       1,845    (Charge)/credit to income tax (see Note 18)     1,495         35         (591 )  (Charge)/credit to investment in equity companies     (30 )       11         (133 )  (Charge)/credit to other comprehensive income including noncontrolling interests, after tax   $ (3,690 )     $ (121 )     $ 1,121    Charge/(credit) to equity of noncontrolling interests     288         95         93    (Charge)/credit to other comprehensive income attributable to ExxonMobil   $ (3,402 )     $ (26 )     $ 1,214
Fair Value Of The Benefit Plan Assets (Pension)	U.S. Pension         Non-U.S. Pension       Fair Value Measurement at December 31, 2011, Using:               Fair Value Measurement at December 31, 2011, Using:              Quoted Prices in Active Markets for Identical Assets (Level 1)     Significant Other Observable Inputs (Level 2)     Significant Unobservable Inputs (Level 3)     Total          Quoted Prices in Active Markets for Identical Assets (Level 1)     Significant Other Observable Inputs (Level 2)     Significant Unobservable Inputs (Level 3)     Total       (millions of dollars)         (millions of dollars)   Asset category:                   Equity securities                   U.S.   $    –      $ 2,247 (1)     $ –      $ 2,247        $ –      $ 2,589 (1)    $ –      $ 2,589    Non-U.S.     –        2,636 (1)      –        2,636          194 (2)      4,835 (1)      –        5,029    Private equity     –        –        458 (3)      458          –        –        393 (3)      393    Debt securities                   Corporate     –        2,728 (4)      –        2,728          2 (5)      1,857 (4)      –        1,859    Government     –        2,482 (4)      –        2,482          186 (5)      6,317 (4)      –        6,503    Asset-backed     –        11 (4)      –        11          –        102 (4)      –        102    Private mortgages     –        –        –        –          –        –        4 (6)      4    Real estate funds     –        –        –        –          –        –        397 (7)      397    Cash     –        71 (8)       –        71          76        13 (9)       –        89    Total at fair value   $    –      $ 10,175      $ 458      $ 10,633        $ 458      $ 15,713      $ 794      $ 16,965    Insurance contracts at contract value           23                152    Total plan assets         $ 10,656              $ 17,117      (1) For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.   (2) For non-U.S. equity securities held in separate accounts, fair value is based on observable quoted prices on active exchanges.   (3) For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.   (4) For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.   (5) For corporate and government debt securities that are traded on active exchanges, fair value is based on observable quoted prices.   (6) For private mortgages, fair value is based on proprietary credit spread matrices developed using market data and monthly surveys of active mortgage bankers.   (7) For real estate funds, fair value is based on appraised values developed using comparable market transactions.   (8) For cash balances held in the form of short-term fund units that are redeemable at the measurement date, the fair value is treated as a Level 2 input.   (9) For cash balances that are subject to withdrawal penalties or other adjustments, the fair value is treated as a Level 2 input.	U.S. Pension         Non-U.S. Pension       Fair Value Measurement at December 31, 2010, Using:               Fair Value Measurement at December 31, 2010, Using:              Quoted Prices in Active Markets for Identical Assets (Level 1)     Significant Other Observable Inputs (Level 2)     Significant Unobservable Inputs (Level 3)     Total          Quoted Prices in Active Markets for Identical Assets (Level 1)     Significant Other Observable Inputs (Level 2)     Significant Unobservable Inputs (Level 3)     Total       (millions of dollars)         (millions of dollars)   Asset category:                   Equity securities                   U.S.   $     –      $ 2,648 (1)     $ –      $ 2,648        $ –      $ 2,443 (1)    $ –      $ 2,443    Non-U.S.     –        3,530 (1)      –        3,530          228 (2)       6,502 (1)      –        6,730    Private equity     –        –        408 (3)       408          –        –        315 (3)       315    Debt securities                   Corporate     –        1,152 (4)       –        1,152          2 (5)       1,629 (4)      –        1,631    Government     –        2,847 (4)      –        2,847          146 (5)       4,709 (4)      –        4,855    Asset-backed     –        31 (4)      –        31          –        98 (4)      –        98    Private mortgages     –        –        128 (6)       128          –        –        4 (6)      4    Real estate funds     –        –        –        –          –        –        417 (7)      417    Cash     68        –        –        68          63        51 (8)       –        114    Total at fair value   $   68      $ 10,208      $ 536      $ 10,812        $ 439      $ 15,432      $ 736      $ 16,607    Insurance contracts at contract value           23                158    Total plan assets         $ 10,835              $ 16,765      (1) For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.   (2) For non-U.S. equity securities held in separate accounts, fair value is based on observable quoted prices on active exchanges.   (3) For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.   (4) For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.   (5) For corporate and government debt securities that are traded on active exchanges, fair value is based on observable quoted prices.   (6) For private mortgages, fair value is based on proprietary credit spread matrices developed using market data and monthly surveys of active mortgage bankers.   (7) For real estate funds, fair value is based on appraised values developed using comparable market transactions.   (8) For cash balances that are subject to withdrawal penalties or other adjustments, the fair value is treated as a Level 2 input.
Fair Value Of The Benefit Plan Assets (Other Postretirement)	Other Postretirement       Fair Value Measurement at December 31, 2011, Using:               Quoted Prices in Active Markets for Identical Assets (Level 1)        Significant Other Observable Inputs (Level 2)      Significant Unobservable Inputs (Level 3)      Total       (millions of dollars)   Asset category:              Equity securities              U.S.   $   –         $ 166 (1)     $   –       $ 166    Non-U.S.     –           155 (1)       –         155    Private equity     –           –         7 (2)       7    Debt securities              Corporate     –           77 (3)       –         77    Government     –           120 (3)       –         120    Asset-backed     –           12 (3)       –         12    Private mortgages     –           –         –         –    Cash     –           1         –         1    Total at fair value   $   –         $ 531       $   7       $ 538      (1) For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.   (2) For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.   (3) For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.	Other Postretirement       Fair Value Measurement at December 31, 2010, Using:               Quoted Prices in Active Markets for Identical Assets (Level 1)        Significant Other Observable Inputs (Level 2)      Significant Unobservable Inputs (Level 3)      Total       (millions of dollars)   Asset category:              Equity securities              U.S.   $ –         $ 180 (1)     $ –       $ 180    Non-U.S.     –           191 (1)       –         191    Private equity     –           –         5 (2)       5    Debt securities              Corporate     –           49 (3)       –         49    Government     –           117 (3)       –         117    Asset-backed     –           13 (3)       –         13    Private mortgages     –           –         2 (4)       2    Cash       1           –           –         1    Total at fair value   $ 1         $ 550       $ 7       $ 558      (1) For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.   (2) For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.   (3) For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.   (4) For private mortgages, fair value is based on proprietary credit spread matrices developed using market data and monthly surveys of active mortgage bankers.
Change In Fair Value Of Level 3 Assets	2011       Pension             Other Postretirement       U.S.           Non U.S.                             Private Equity      Private Mortgages            Private Equity      Private Mortgages      Real Estate              Private Equity      Private Mortgages       (millions of dollars)                       Fair value at January 1   $ 408       $ 128            $ 315       $ 4       $ 417              $ 5       $ 2                        Net realized gains/(losses)     1         5              7         –         3                –         –    Net unrealized gains/(losses)     56         –              33         –         6                2         –    Net purchases/(sales)     (7 )       (133 )            38         –         (29)                –         (2)    Fair value at December 31   $ 458       $ –            $ 393       $ 4       $ 397              $ 7       $ –	2010       Pension          Other Postretirement       U.S.          Non U.S.                            Private Equity        Private Mortgages           Private Equity      Private Mortgages      Real Estate           Private Equity        Private Mortgages       (millions of dollars)                       Fair value at January 1   $ 349         $ 280           $ 239       $ 5       $ 413           $ 4         $ 3                        Net realized gains/(losses)     –           36             (1 )       (1 )       –             –           1    Net unrealized gains/(losses)     47           (3 )           26         1         (4 )           1           –    Net purchases/(sales)     12           (185 )           51         (1 )       8             –           (2 )  Fair value at December 31   $ 408         $ 128           $ 315       $ 4       $ 417           $ 5         $ 2
Pension Plans With Accumulated Benefit Obligation In Excess Of Plan Assets	Pension Benefits       U.S.         Non-U.S.        2011     2010          2011     2010       (millions of dollars)   For funded pension plans with an accumulated benefit obligation in excess of plan assets:           Projected benefit obligation   $ 14,797      $ 13,184        $ 17,668      $ 9,865    Accumulated benefit obligation     12,606        11,383          16,175        9,074    Fair value of plan assets     10,655        10,834          12,832        7,131    For unfunded pension plans:           Projected benefit obligation   $ 2,238      $ 1,823        $ 6,632      $ 6,188    Accumulated benefit obligation     1,475        1,381          5,753        5,413          Pension Benefits         Other Postretirement Benefits        U.S.     Non-U.S.              (millions of dollars)   Estimated 2012 amortization from accumulated other comprehensive income:         Net actuarial loss/(gain) (1)   $ 1,033      $ 889        $ 173    Prior service cost (2)     7        109          34      (1) The Corporation amortizes the net balance of actuarial losses/(gains) as a component of net periodic benefit cost over the average remaining service period of active plan participants.   (2) The Corporation amortizes prior service cost on a straight-line basis as permitted under authoritative guidance for defined benefit pension and other postretirement benefit plans.
Expected Contribution Pension Benefits And Other Postretirement Benefits	Pension Benefits            Other Postretirement Benefits           U.S.        Non-U.S.             Gross        Medicare Subsidy Receipt          (millions of dollars)               Contributions expected in 2012      $ 1,650         $ 1,250             $ –         $ –    Benefit payments expected in:                                                 2012        1,490           1,342               442           23    2013        1,579           1,360               458           25    2014        1,547           1,383               472           26    2015        1,524           1,418               485           27    2016        1,489           1,462               497           28    2017 - 2021        6,616           7,731               2,611           163

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Disclosures About Segments And Related Information (Tables)	12 Months Ended
Dec. 31, 2011
Disclosures About Segments And Related Information [Abstract]
Disclosures About Segments And Related Information	Upstream     Downstream     Chemical     Corporate  and Financing     Corporate Total        U.S.     Non-U.S.     U.S.     Non-U.S.     U.S.     Non-U.S.           (millions of dollars)   As of December 31, 2011                 Earnings after income tax   $ 5,096      $ 29,343      $ 2,268      $ 2,191      $ 2,215      $ 2,168      $ (2,221 )    $ 41,060    Earnings of equity companies included above     2,045        11,768        7        353        198        1,365        (447 )      15,289    Sales and other operating revenue (1)     14,023        32,419        120,844        257,779        15,466        26,476        22        467,029    Intersegment revenue     9,807        49,910        18,489        73,549        12,226        10,563        262        –    Depreciation and depletion expense     4,879        7,021        650        1,560        380        458        635        15,583    Interest revenue     –        –        –        –        –        –        135        135    Interest expense     30        36        10        24        2        (1 )      146        247    Income taxes     2,852        25,755        1,123        696        1,027        465        (867 )      31,051    Additions to property, plant and equipment     10,887        18,934        400        1,334        241        910        932        33,638    Investments in equity companies     2,963        8,439        210        1,358        253        3,973        (228 )      16,968    Total assets     82,900        127,977        18,354        51,132        7,245        19,862        23,582        331,052    As of December 31, 2010                 Earnings after income tax   $ 4,272      $ 19,825      $ 770      $ 2,797      $ 2,422      $ 2,491      $ (2,117 )    $ 30,460    Earnings of equity companies included above     1,261        8,415        23        225        171        1,163        (581 )      10,677    Sales and other operating revenue (1)     8,895        26,046        93,599        206,042        13,402        22,119        22        370,125    Intersegment revenue     8,102        39,066        13,546        52,697        9,694        8,421        282        –    Depreciation and depletion expense     3,506        7,574        681        1,565        421        432        581        14,760    Interest revenue     –        –        –        –        –        –        118        118    Interest expense     20        25        1        19        1        4        189        259    Income taxes     2,219        18,627        360        560        736        347        (1,288 )      21,561    Additions to property, plant and equipment     52,300        16,937        888        1,332        247        1,733        719        74,156    Investments in equity companies     2,636        9,625        254        1,240        285        3,586        (197 )      17,429    Total assets     76,725        115,646        18,378        47,402        7,148        19,087        18,124        302,510    As of December 31, 2009                 Earnings after income tax   $ 2,893      $ 14,214      $ (153 )    $ 1,934      $ 769      $ 1,540      $ (1,917 )    $ 19,280    Earnings of equity companies included above     1,216        5,269        (102 )      188        164        906        (498 )      7,143    Sales and other operating revenue (1)     3,406        21,355        76,467        173,404        9,962        16,885        21        301,500    Intersegment revenue     6,718        32,982        10,168        39,190        7,185        6,947        284        –    Depreciation and depletion expense     1,768        6,376        687        1,665        400        457        564        11,917    Interest revenue     –        –        –        –        –        –        179        179    Interest expense     38        27        10        18        4        1        450        548    Income taxes     1,451        15,183        (164 )      (22 )      281        (182 )      (1,428 )      15,119    Additions to property, plant and equipment     2,973        13,307        1,449        1,447        294        2,553        468        22,491    Investments in equity companies     2,440        8,864        323        1,190        259        2,873        (207 )      15,742    Total assets     24,940        102,372        17,493        45,098        7,044        17,117        19,259        233,323
Geographic Sales And Other Operating Revenue	Geographic Sales and other operating revenue (1)   2011     2010     2009       (millions of dollars)   United States   $ 150,343      $ 115,906      $ 89,847    Non-U.S.     316,686        254,219        211,653    Total   $ 467,029      $ 370,125      $ 301,500    Significant non-U.S. revenue sources include:   United Kingdom   $ 34,833      $ 24,637      $ 20,293    Canada     34,626        27,243        21,151    Japan     31,925        27,143        22,054    Belgium     26,926        21,139        16,857    France     18,510        13,920        12,042    Germany     17,034        14,301        14,839    Italy     16,288        14,132        12,997    Singapore     14,400        11,088        8,400
Schedule Of Long-Lived Assets By Geographic Regions	Long-lived assets   2011     2010     2009       (millions of dollars)   United States   $ 91,146      $ 86,021      $ 37,138    Non-U.S.     123,518        113,527        101,978    Total   $ 214,664      $ 199,548      $ 139,116    Significant non-U.S. long-lived assets include:   Canada   $ 24,458      $ 20,879      $ 15,919    Nigeria     11,806        11,429        11,046    Angola     10,395        8,570        7,320    Australia     9,474        6,570        4,247    Singapore     9,285        8,610        7,238    Kazakhstan     7,022        5,938        4,748    Norway     6,039        6,988        7,251    United Kingdom     5,008        6,177        7,609      (1) Sales and other operating revenue includes sales-based taxes of $33,503 million for 2011, $28,547 million for 2010 and $25,936 million for 2009. See Note 1, Summary of Accounting Policies.

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Income, Sales-Based And Other Taxes (Tables)	12 Months Ended
Dec. 31, 2011
Income, Sales-Based And Other Taxes [Abstract]
Schedule Of Income, Sales-Based And Other Taxes	2011     2010     2009        U.S.     Non-U.S.     Total     U.S.     Non-U.S.     Total     U.S.     Non-U.S.     Total       (millions of dollars)   Income tax expense                   Federal and non-U.S.                   Current   $ 1,547      $ 28,849      $ 30,396      $ 1,224      $ 21,093      $ 22,317      $ (838 )    $ 15,830      $ 14,992    Deferred – net     1,577        (1,417 )      160        49        (1,191 )      (1,142 )      650        (665 )      (15 )  U.S. tax on non-U.S. operations     15        –        15        46        –        46        32        –        32    Total federal and non-U.S.     3,139        27,432        30,571        1,319        19,902        21,221        (156 )      15,165        15,009    State     480        –        480        340        –        340        110        –        110    Total income tax expense     3,619        27,432        31,051        1,659        19,902        21,561        (46 )      15,165        15,119    Sales-based taxes     5,652        27,851        33,503        6,182        22,365        28,547        6,271        19,665        25,936    All other taxes and duties                   Other taxes and duties     1,539        38,434        39,973        776        35,342        36,118        581        34,238        34,819    Included in production and manufacturing expenses     1,342        1,425        2,767        1,001        1,237        2,238        699        1,318        2,017    Included in SG&A expenses     181        623        804        201        570        771        197        538        735    Total other taxes and duties     3,062        40,482        43,544        1,978        37,149        39,127        1,477        36,094        37,571    Total   $ 12,333      $ 95,765      $ 108,098      $ 9,819      $ 79,416      $ 89,235      $ 7,702      $ 70,924      $ 78,626
Income Taxes (Charged)/Credited Directly To Equity	2011     2010     2009       (millions of dollars)   Cumulative foreign exchange translation adjustment   $ 89      $ (42 )    $ (247 )  Postretirement benefits reserves adjustment:       Net actuarial loss/(gain)     2,016        553        (94 )  Amortization of actuarial loss/(gain)     (503 )      (609 )      (649 )  Prior service cost     47        92        20    Amortization of prior service cost     (41 )      (45 )      (43 )  Foreign exchange rate changes     (24 )      44        175    Total postretirement benefits reserves adjustment     1,495        35        (591 )  Other components of equity     236        246        140
Reconciliation Between Income Tax Expense And A Theoretical U.S. Tax	2011     2010     2009       (millions of dollars)   Income before income taxes       United States   $ 11,511      $ 7,711      $ 2,576    Non-U.S.     61,746        45,248        32,201    Total   $ 73,257      $ 52,959      $ 34,777    Theoretical tax   $ 25,640      $ 18,536      $ 12,172    Effect of equity method of accounting     (5,351 )      (3,737 )      (2,500 )  Non-U.S. taxes in excess of theoretical U.S. tax     10,385        7,293        5,948    U.S. tax on non-U.S. operations     15        46        32    State taxes, net of federal tax benefit     312        221        72    Other U.S.     50        (798 )      (605 )  Total income tax expense   $ 31,051      $ 21,561      $ 15,119    Effective tax rate calculation       Income taxes   $ 31,051      $ 21,561      $ 15,119    ExxonMobil share of equity company income taxes     5,603        4,058        2,489    Total income taxes     36,654        25,619        17,608    Net income including noncontrolling interests     42,206        31,398        19,658    Total income before taxes   $ 78,860      $ 57,017      $ 37,266    Effective income tax rate         46%            45%            47%
Deferred Tax Liabilities/(Assets)	Tax effects of temporary differences for:   2011     2010       (millions of dollars)   Property, plant and equipment   $ 45,951      $ 42,657    Other liabilities     4,281        4,278    Total deferred tax liabilities   $ 50,232      $ 46,935    Pension and other postretirement benefits   $ (7,930 )    $ (5,634 )  Asset retirement obligations     (5,302 )      (4,461 )  Tax loss carryforwards     (3,166 )      (3,243 )  Other assets     (7,079 )      (6,070 )  Total deferred tax assets   $ (23,477 )    $ (19,408 )  Asset valuation allowances     1,304        1,183    Net deferred tax liabilities   $ 28,059      $ 28,710
Deferred Income Tax (Assets) And Liabilities By Balance Sheet Classification	Balance sheet classification   2011     2010       (millions of dollars)   Other current assets   $ (4,549 )    $ (3,359 )  Other assets, including intangibles, net     (4,218 )      (3,527 )  Accounts payable and accrued liabilities     208        446    Deferred income tax liabilities     36,618        35,150    Net deferred tax liabilities   $ 28,059      $ 28,710
Unrecognized Tax Benefits	Gross unrecognized tax benefits   2011     2010     2009       (millions of dollars)   Balance at January 1   $ 4,148      $ 4,725      $ 4,976    Additions based on current year's tax positions     822        830        547    Additions for prior years' tax positions     451        620        262    Reductions for prior years' tax positions     (329 )      (505 )      (594 )  Reductions due to lapse of the statute of limitations     –        (534 )      –    Settlements with tax authorities     (145 )      (999 )      (592 )  Foreign exchange effects/other     (25 )      11        126    Balance at December 31   $ 4,922      $ 4,148      $ 4,725
Remaining Tax Years Subject To Examination By Major Tax Jurisdiction	Country of Operation    Open Tax Years Abu Dhabi    2000 - 2011 Angola    2007 - 2011 Australia    2000 - 2011 Canada    1994 - 2011 Equatorial Guinea    2006 - 2011 Germany    1999 - 2011 Japan    2004 - 2011 Malaysia    2005 - 2011 Nigeria    1998 - 2011 Norway    2000 - 2011 United Kingdom    2009 - 2011 United States    2004 - 2011

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Acquisition Of XTO Energy Inc. (Tables)	12 Months Ended
Dec. 31, 2011
Acquisition Of XTO Energy Inc. [Abstract]
Components Of Consideration Transferred In Merger Of XTO Energy Inc.	(millions of dollars)   Consideration attributable to stock issued (1) (2)   $ 24,480    Consideration attributable to converted stock options (2)     179    Total consideration transferred   $ 24,659      (1) The fair value of the Corporation's common stock on the acquisition date was $59.10 per share based on the closing value on the NYSE. The Corporation issued 416 million shares of stock previously held in treasury. The treasury stock issued, based on the average cost, was valued at $21,139 million. The excess of the fair value of the consideration transferred over the cost of treasury stock issued was $3,520 million and was included in common stock without par value. (2) The portion of the fair value of XTO converted stock-based awards attributable to pre-merger employee service was part of consideration. The remaining fair value of the awards is recognized over the requisite service period.
Recording Of Assets Acquired And Liabilities Assumed In Merger Of XTO Energy Inc.	(millions of dollars)   Current assets   $ 2,053    Property, plant and equipment (1)     47,300    Goodwill (2)     39    Other assets     620    Total assets acquired   $ 50,012    Current liabilities   $ 2,615    Long-term debt (3)     10,574    Deferred income tax liabilities (4)     11,204    Other long-term obligations     960    Total liabilities assumed   $ 25,353    Net assets acquired   $ 24,659      (1) Property, plant and equipment were measured primarily using an income approach. The fair value measurements of the oil and gas assets were based, in part, on significant inputs not observable in the market and thus represent a Level 3 measurement. The significant inputs included XTO resources, assumed future production profiles, commodity prices (mainly based on observable market inputs), risk adjusted discount rate of 7 percent, inflation of 2 percent and assumptions on the timing and amount of future development and operating costs. The property, plant and equipment additions were segmented to the Upstream business, with substantially all of the assets in the United States.   (2) Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill was recognized in the Upstream reporting unit. Goodwill is not amortized and is not deductible for tax purposes. (3) Long-term debt was recognized at market rates at closing (Level 1). (4) Deferred income taxes reflect the temporary differences between the amount of assets and liabilities recognized for financial reporting purposes and such amounts recognized for tax purposes.

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Subsequent Event (Tables)	12 Months Ended
Dec. 31, 2011
Subsequent Event [Abstract]
Major Classes Of Assets And Liabilities Classified As Held For Sale Had Transaction Met Criteria As Of December 31, 2011	(millions of dollars)   Assets   Current assets (1)   $ 6,862    Net property, plant and equipment     4,740    Other assets     1,757    Total assets   $ 13,359    Liabilities   Current liabilities   $ 8,450    Postretirement benefits reserves     2,103    Other long-term obligations     1,179    Total liabilities   $ 11,732    Equity   ExxonMobil share of equity (2)   $ (467 )  Noncontrolling interests     2,094    Total equity   $ 1,627    Total liabilities and equity   $ 13,359      (1) Current assets include $1,882 million of crude oil, products and merchandise inventory.   (2) On the date the Corporation transfers control to TG, the ExxonMobil share of accumulated other comprehensive income will be recycled as a benefit to earnings. At December 31, 2011, the total accumulated other comprehensive income was $1,482 million.

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Miscellaneous Financial Information (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Miscellaneous Financial Information [Abstract]
Research and development costs	$ 1,044,000,000	$ 1,012,000,000	$ 1,050,000,000
Foreign currency transaction losses, before tax	184,000,000	251,000,000
Foreign currency transaction gains, before tax			54,000,000
Gains on combined effects of LIFO inventory accumulations and draw-downs	292,000,000	317,000,000	207,000,000
Replacement cost of inventories estimated to exceed LIFO carrying values	$ 25,600,000,000	$ 21,300,000,000

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Miscellaneous Financial Information (Crude Oil, Products And Merchandise) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Miscellaneous Financial Information [Abstract]
Petroleum products	$ 4,100,000,000	$ 3,500,000,000
Crude oil	4,800,000,000	3,800,000,000
Chemical products	2,300,000,000	2,100,000,000
Gas / other	500,000,000	500,000,000
Total	$ 11,665,000,000	$ 9,852,000,000

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Cash Flow Information (Cash Payments For Interest And Income Taxes) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Flow Information [Abstract]
Cash payments for interest	$ 557,000,000	$ 703,000,000	$ 820,000,000
Cash payments for income taxes	27,254,000,000	18,941,000,000	15,427,000,000
Deposit for potential asset sale	$ 3,600,000,000

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Additional Working Capital Information (Narrative) (Details) (USD $) In Billions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Additional Working Capital Information [Abstract]
Unused credit lines for short-term financing	$ 5.5
Commercial paper programs under terms negotiated	$ 2.8
The weighted-average interest rate on short-term borrowings outstanding	1.90%	1.20%

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Additional Working Capital Information (Schedule Of Notes, Accounts Receivable And Payable, Loans Payable, Accrued Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Additional Working Capital Information [Abstract]
Trade, less reserves of $128 million and $152 million	$ 30,044	$ 25,439
Other, less reserves of $39 million and $34 million	8,598	6,845
Total	38,642	32,284
Bank loans	1,237	532
Commercial paper	2,281	1,346
Long-term debt due within one year	3,431	345
Other	762	564
Total	7,711	2,787
Trade payables	33,969	30,780
Payables to equity companies	5,553	5,450
Accrued taxes other than income taxes	7,123	6,778
Other	10,422	7,026
Total	57,067	50,034
Trade, reserves	128	152
Other, reserves	$ 39	$ 34

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Equity Company Information (Narrative) (Details)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Equity Company Information [Abstract]
Share of equity company sales revenues from consolidated companies	19.00%	18.00%	19.00%

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Equity Company Information (Schedule Of Equity Company Financial Summary) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Subsidiary or Equity Method Investee [Line Items]
Income before income taxes	$ 73,257	$ 52,959	$ 34,777
Net assets	16,968	17,429	15,742
ExxonMobil Share Of Equity [Member]
Subsidiary or Equity Method Investee [Line Items]
Total revenues	65,147	48,355	36,570
Income before income taxes	20,892	14,735	9,632
Income taxes	5,603	4,058	2,489
Income from equity affiliates	15,289	10,677	7,143
Current assets	17,317	15,860	12,843
Long-term assets	30,833	29,805	27,983
Total assets	48,150	45,665	40,826
Current liabilities	12,454	10,260	8,085
Long-term liabilities	18,728	17,976	16,999
Net assets	16,968	17,429	15,742
Total Equity Company Including All Owners [Member]
Subsidiary or Equity Method Investee [Line Items]
Total revenues	204,635	153,020	112,153
Income before income taxes	68,908	48,075	28,472
Income taxes	19,812	13,962	7,775
Income from equity affiliates	49,096	34,113	20,697
Current assets	52,879	48,573	37,376
Long-term assets	96,908	90,646	88,153
Total assets	149,787	139,219	125,529
Current liabilities	41,016	33,160	24,854
Long-term liabilities	62,472	59,596	57,384
Net assets	$ 46,299	$ 46,463	$ 43,291

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Equity Company Information (Schedule Of Corporation's Percentage Ownership Interest) (Details)	Dec. 31, 2011
Upstream [Member] | Aera Energy LLC [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	48.00%
Upstream [Member] | BEB Erdgas und Erdoel GmbH [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	50.00%
Upstream [Member] | Cameroon Oil Transportation Company S.A. [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	41.00%
Upstream [Member] | Castle Peak Power Company Limited [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	60.00%
Upstream [Member] | Golden Pass LNG Terminal LLC [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	18.00%
Upstream [Member] | Nederlandse Aardolie Maatschappij B.V. [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	50.00%
Upstream [Member] | Qatar Liquefied Gas Company Limited [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	10.00%
Upstream [Member] | Qatar Liquefied Gas Company Limited 2 [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	24.00%
Upstream [Member] | Ras Laffan Liquefied Natural Gas Company Limited [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	25.00%
Upstream [Member] | Ras Laffan Liquefied Natural Gas Company Limited II [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	31.00%
Upstream [Member] | Ras Laffan Liquefied Natural Gas Company Limited (3) [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	30.00%
Upstream [Member] | South Hook LNG Terminal Company Limited [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	24.00%
Upstream [Member] | Tengizchevroil, LLP [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	25.00%
Upstream [Member] | Terminale GNL Adriatico S.R.L. [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	71.00%
Downstream [Member] | Chalmette Refining, LLC [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	50.00%
Downstream [Member] | Fujian Refining And Petrochemical Co. LTD. [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	25.00%
Downstream [Member] | Saudi Aramco Mobil Refinery Company LTD. [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	50.00%
Chemical [Member] | Al-Jubail Petrochemical Company [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	50.00%
Chemical [Member] | Infineum Holdings B.V. [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	50.00%
Chemical [Member] | Saudi Yanbu Petrochemical Co. [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	50.00%
Chemical [Member] | Toray Tonen Specialty Separator Godo Kaisha [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage Ownership Interest	50.00%

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Investments, Advances And Long-Term Receivables (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investments, Advances And Long-Term Receivables [Abstract]
Investments (Companies carried at equity in underlying assets)	$ 16,968	$ 17,429	$ 15,742
Advances (Companies carried at equity in underlying assets)	9,740	9,286
Total equity company investments and advances	26,708	26,715
Companies carried at cost or less and stock investments carried at fair value	1,544	1,557
Long-term receivables and miscellaneous investments at cost or less, net of reserves of $469 million and $292 million	6,081	7,066
Total	34,333	35,338
Reserves for Long-term receivables and miscellaneous investments	$ 469	$ 292

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Property, Plant And Equipment And Asset Retirement Obligations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Accumulated depreciation and depletion	$ 179,331	$ 174,390
Interest capitalized	$ 593	$ 532	$ 425
Refinery And Lubes Basestock [Member] | Downstream [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of equipment, years	25
Service Station Buildings And Fixed Improvements [Member] | Downstream [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of equipment, years	20
Chemical [Member] | Investments In Process Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of equipment, years	20

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Property, Plant And Equipment And Asset Retirement Obligations (Property, Plant And Equipment) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	$ 393,995	$ 373,938
Property, Plant and Equipment, Net	214,664	199,548	139,116
Upstream [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	283,710	264,136
Property, Plant and Equipment, Net	163,975	148,152
Downstream [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	67,900	68,652
Property, Plant and Equipment, Net	28,801	30,095
Chemical [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	30,405	29,524
Property, Plant and Equipment, Net	14,469	14,255
Other [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	11,980	11,626
Property, Plant and Equipment, Net	$ 7,419	$ 7,046

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Property, Plant And Equipment And Asset Retirement Obligations (Asset Retirement Obligations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Property, Plant And Equipment And Asset Retirement Obligations [Abstract]
Beginning balance	$ 9,614	$ 8,473
Accretion expense and other provisions	581	563
Reduction due to property sales	(854)	(183)
Payments made	(662)	(638)
Liabilities incurred	117	1,094
Foreign currency translation	(62)	(45)
Revisions	1,844	350
Ending balance	$ 10,578	$ 9,614

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Accounting For Suspended Exploratory Well Costs (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Exploratory Wells Drilled [Line Items]
Number of projects that have exploratory well costs capitalized for a period greater than twelve months as of December 31, 2011	58	59	57
Number of projects that have drilling in the preceding twelve months or exploratory activity planned in the next two years as of December 31, 2011	26
Number of projects with completed exploratory activity progressing toward development as of December 31, 2011	32
Capitalized exploratory well costs	$ 2,881	$ 2,893	$ 2,005	$ 1,585
Total 32 Projects [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	$ 1,133

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Accounting For Suspended Exploratory Well Costs (Change In Capitalized Suspended Exploratory Well Costs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounting For Suspended Exploratory Well Costs [Abstract]
Capitalized exploratory well costs, beginning balance	$ 2,893	$ 2,005	$ 1,585
Additions pending the determination of proved reserves	310	1,103	624
Charged to expense	(213)	(104)	(51)
Reclassifications to wells, facilities and equipment based on the determination of proved reserves	(149)	(136)	(200)
Other	40	25	47
Capitalized exploratory well costs, ending balance	2,881	2,893	2,005
Ending balance attributed to equity companies included above			$ 9

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Accounting For Suspended Exploratory Well Costs (Schedule Of Period End Capitalized Suspended Exploratory Well Costs) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized for a period of one year or less	$ 310	$ 1,103	$ 624
Capitalized suspended exploratory well costs, total	2,881	2,893	2,005	1,585
Capitalized For A Period Of Between One And Five Years [Member]
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized suspended exploratory well costs	1,922	1,294	924
Capitalized For A Period Of Between Five And Ten Years [Member]
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized suspended exploratory well costs	409	278	220
Capitalized For A Period Of Greater Than Ten Years [Member]
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized suspended exploratory well costs	240	218	237
Capitalized For A Period Greater Than One Year [Member]
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized suspended exploratory well costs	$ 2,571	$ 1,790	$ 1,381

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Accounting For Suspended Exploratory Well Costs (Schedule Of Number Of Projects With Suspended Exploratory Well Costs) (Details)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounting For Suspended Exploratory Well Costs [Abstract]
Number of projects with first capitalized well drilled in the preceding 12 months	4	9	18
Number of projects that have exploratory well costs capitalized for a period of greater than 12 months	58	59	57
Total	62	68	75

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Accounting For Suspended Exploratory Well Costs (Schedule Of Additional Detail For The Projects) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	$ 2,881	$ 2,893	$ 2,005	$ 1,585
Total 32 Projects [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	1,133
Angola [Member] | Project In Angola - Perpetua-Zina- Acacia [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	15
Years wells drilled, period	2008 - 2009
Australia [Member] | Project In Australia - East Pilchard [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	10
Years wells drilled, period	2001
Australia [Member] | Projects In Australia - SE Longtom [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	15
Years wells drilled, period	2010
Indonesia [Member] | Project In Indonesia - Natuna [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	118
Years wells drilled, period	1981 - 1983
Kazakhstan [Member] | Project In Kazakhstan - Kairan [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	53
Years wells drilled, period	2004 - 2007
Malaysia [Member] | Project In Malaysia - Besar [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	18
Years wells drilled, period	1992 - 2010
Malaysia [Member] | Other 2 Projects In Malaysia [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	8
Years wells drilled, period	1979 - 1995
Nigeria [Member] | Project In Nigeria - Bolia [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	15
Years wells drilled, period	2002 - 2006
Nigeria [Member] | Project In Nigeria - Bosi [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	79
Years wells drilled, period	2002 - 2006
Nigeria [Member] | Project In Nigeria - Pegi [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	32
Years wells drilled, period	2009
Nigeria [Member] | Other 4 Projects In Nigeria [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	13
Years wells drilled, period	2002
Norway [Member] | Project In Norway - Gamma [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	20
Years wells drilled, period	2008 - 2009
Norway [Member] | Project In Norway - H-North [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	15
Years wells drilled, period	2007
Norway [Member] | Project In Norway - Lavrans [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	22
Years wells drilled, period	1995 - 1999
Norway [Member] | Project In Norway - Nyk High [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	19
Years wells drilled, period	2008
Norway [Member] | Other 6 Projects In Norway [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	26
Years wells drilled, period	1992 - 2010
Papua New Guinea [Member] | Project In Papua New Guinea - Juha [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	28
Years wells drilled, period	2007
United Kingdom [Member] | Project In United Kingdom - Fram [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	55
Years wells drilled, period	2009
United Kingdom [Member] | Other 2 Projects In United Kingdom [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	14
Years wells drilled, period	2001 - 2004
United States [Member] | Project In United States - Julia Unit [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	78
Years wells drilled, period	2007 - 2008
United States [Member] | Project In United States - Point Thomson [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	449
Years wells drilled, period	1977 - 2010
United States [Member] | Project In United States - Tip Top [Member]
Exploratory Wells Drilled [Line Items]
Capitalized exploratory well costs	$ 31
Years wells drilled, period	2009

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Leased Facilities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Leased Facilities [Abstract]
Minimum undiscounted lease commitments	$ 7,914
Estimated related rental income from noncancelable subleases	$ 107

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Leased Facilities (Leased Facilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Leased Facilities [Abstract]
Lease Payments Under Minimum Commitments, 2012	$ 2,152
Lease Payments Under Minimum Commitments, 2013	1,696
Lease Payments Under Minimum Commitments, 2014	1,219
Lease Payments Under Minimum Commitments, 2015	802
Lease Payments Under Minimum Commitments, 2016	415
Lease Payments Under Minimum Commitments, 2017 and beyond	1,630
Lease Payments Under Minimum Commitments, Total	7,914
Related Sublease Rental Income, 2012	18
Related Sublease Rental Income, 2013	17
Related Sublease Rental Income, 2014	15
Related Sublease Rental Income, 2015	12
Related Sublease Rental Income, 2016	10
Related Sublease Rental Income, 2017 and beyond	35
Related Sublease Rental Income, Total	$ 107

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Leased Facilities (Net Rental Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Leased Facilities [Abstract]
Rental cost	$ 4,061	$ 3,762	$ 4,426
Less sublease rental income	74	90	98
Net rental cost	$ 3,987	$ 3,672	$ 4,328

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Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income attributable to ExxonMobil	$ 41,060	$ 30,460	$ 19,280
Earnings per common share (dollars)	$ 8.43	$ 6.24	$ 3.99
Earnings per common share - assuming dilution (dollars)	$ 8.42	$ 6.22	$ 3.98
Dividends paid per common share (dollars)	$ 1.85	$ 1.74	$ 1.66
Earnings Per Common Share [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income attributable to ExxonMobil	41,060	30,460	19,280
Weighted average number of common shares outstanding	4,870	4,885	4,832
Earnings per common share (dollars)	$ 8.43	$ 6.24	$ 3.99
Earnings Per Common Share - Assuming Dilution [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income attributable to ExxonMobil	$ 41,060	$ 30,460	$ 19,280
Weighted average number of common shares outstanding	4,870	4,885	4,832
Effect of employee stock-based awards	5	12	16
Weighted average number of common shares outstanding - assuming dilution	4,875	4,897	4,848
Earnings per common share - assuming dilution (dollars)	$ 8.42	$ 6.22	$ 3.98

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Financial Instruments And Derivatives (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Financial Instruments And Derivatives [Line Items]
Estimated fair value of total long-term debt, including capitalized lease obligations	$ 9,800,000,000	$ 12,800,000,000
Recorded book values of total long-term debt, including capitalized lease obligations	9,322,000,000	12,227,000,000
Derivative asset at fair value, net		172,000,000
Derivative liability at fair value, net	3,000,000
Gain (loss) before-tax earnings impact of derivatives	131,000,000	221,000,000	(73,000,000)
Cash Flow Hedges [Member]
Financial Instruments And Derivatives [Line Items]
Gain (loss) before-tax earnings impact of derivatives	$ 136,000,000

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Long-Term Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 SeaRiver Maritime Financial Holdings, Inc. [Member]	Dec. 31, 2011 Guaranteed Deferred Interest Debentures Due 2012 [Member] SeaRiver Maritime Financial Holdings, Inc. [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt due in U.S. dollars	$ 8,855
U.S. dollar equivalent at year-end exchange rates of amounts payable in foreign currencies	467
Portion of long-term debt included in current liability	3,431	345
Long-term debt maturing - 2013	967
Long-term debt maturing - 2014	871
Long-term debt maturing - 2015	606
Long-term debt maturing - 2016	503
Other short-term borrowings				$ 2,662
Exxon Mobil Corporation ownership percent			100.00%

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Long-Term Debt (Summarized Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Debt Instrument, Unamortized Premium	421
Long-term debt	9,322		12,227
SeaRiver Maritime Financial Holdings, Inc. [Member]
Long-term debt			2,389
Esso (Thailand) Public Company Ltd. [Member]
Debt Instrument, maturity date range, start	2012-12-31		2012-12-31
Debt Instrument, maturity date range, end	2017-12-31		2017-12-31
Guaranteed Debt Securities Due 2011 [Member] | SeaRiver Maritime Financial Holdings, Inc. [Member]
Debt maturity			Oct 1, 2011
Guaranteed Deferred Interest Debentures Due 2012 [Member] | SeaRiver Maritime Financial Holdings, Inc. [Member]
Long-term debt			2,389	[1]
Debt maturity	Sep 1, 2012		Sep 1, 2012	[1]
7.500% Senior Note Due 2012 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent			199
Interest rate	7.50%
Debt maturity	Apr 15, 2012
5.900% Senior Note Due 2012 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent			233
Interest rate	5.90%
Debt maturity	Aug 1, 2012
6.250% Senior Note Due 2013 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	185		193
Interest rate	6.25%
Debt maturity	Apr 15, 2013
4.625% Senior Note Due 2013 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	145		149
Interest rate	4.63%
Debt maturity	Jun 15, 2013
5.750% Senior Note Due 2013 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	346		359
Interest rate	5.75%
Debt maturity	Dec 15, 2013
4.900% Senior Note Due 2014 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	260		267
Interest rate	4.90%
Debt maturity	Feb 1, 2014
5.000% Senior Note Due 2015 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	138		142
Interest rate	5.00%
Debt maturity	Jan 31, 2015
5.300% Senior Note Due 2015 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	255		262
Interest rate	5.30%
Debt maturity	Jun 30, 2015
5.650% Senior Note Due 2016 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	222		227
Interest rate	5.65%
Debt maturity	Apr 1, 2016
6.250% Senior Note Due 2017 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	513		534
Interest rate	6.25%
Debt maturity	Aug 1, 2017
5.500% Senior Note Due 2018 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	402		420
Interest rate	5.50%
Debt maturity	Jun 15, 2018
6.500% Senior Note Due 2018 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	506		524
Interest rate	6.50%
Debt maturity	Dec 15, 2018
6.100% Senior Note Due 2036 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	203		204
Interest rate	6.10%
Debt maturity	Apr 1, 2036
6.750% Senior Note Due 2037 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	317		329
Interest rate	6.75%
Debt maturity	Aug 1, 2037
6.375% Senior Note Due 2038 [Member] | XTO Energy Inc. [Member]
Senior notes, noncurrent	241		258
Interest rate	6.38%
Debt maturity	Jun 15, 2038
Variable Note Due 2035 [Member] | Mobil Services (Bahamas) Ltd. [Member]
Senior notes, noncurrent	972	[2]	972	[2]
Debt maturity	May 18, 2035		May 18, 2035
Average effective interest rate	0.20%		0.30%
Variable Note Due 2034 [Member] | Mobil Services (Bahamas) Ltd. [Member]
Senior notes, noncurrent	311	[3]	311	[3]
Debt maturity	Sep 15, 2034		Sep 15, 2034
Average effective interest rate	0.30%		0.40%
Variable Notes Due 2013-2017 [Member] | Mobil Producing Nigeria Unlimited [Member]
Senior notes, noncurrent	543	[4]	415	[4]
Debt Instrument, maturity date range, start	2012-12-31		2012-12-31
Debt Instrument, maturity date range, end	2017-12-31		2017-12-31
Average effective interest rate	4.20%		4.60%
Variable Notes Due 2013-2017 [Member] | Esso (Thailand) Public Company Ltd. [Member]
Senior notes, noncurrent	413	[5]	522	[5]
Average effective interest rate	3.20%		1.70%
Debentures Due 2021 [Member] | Mobil Corporation [Member]
Other long-term debt	248		248
Interest rate	8.63%
Debt maturity	Aug 15, 2021		Aug 15, 2021
Industrial Revenue Bonds Due 2012-2051 [Member] | Combined Exxon Mobil And Affiliates [Member]
Other long-term debt	2,315	[6]	2,247	[6]
Debt Instrument, maturity date range, start	2012-12-31		2012-12-31
Debt Instrument, maturity date range, end	2051-12-31		2051-12-31
Average effective interest rate	0.10%		0.20%
Other U.S. Dollar Obligations [Member] | Combined Exxon Mobil And Affiliates [Member]
Other U.S. dollar obligations	496	[7]	454	[7]
Average effective interest rate	4.80%		4.70%
Other Foreign Currency Obligations [Member] | Combined Exxon Mobil And Affiliates [Member]
Other foreign currency obligations	31		65
Capitalized Lease Obligations [Member] | Combined Exxon Mobil And Affiliates [Member]
Average effective interest rate	8.50%		8.10%
Long-term debt	260	[8]	304	[8]
[1]	Additional information is provided for this subsidiary on the following pages.
[2]	Average effective interest rate of 0.2% in 2011 and 0.3% in 2010.
[3]	Average effective interest rate of 0.3% in 2011 and 0.4% in 2010.
[4]	Average effective interest rate of 4.2% in 2011 and 4.6% in 2010.
[5]	Average effective interest rate of 3.2% in 2011 and 1.7% in 2010.
[6]	Average effective interest rate of 0.1% in 2011 and 0.2% in 2010.
[7]	Average effective interest rate of 4.8% in 2011 and 4.7% in 2010.
[8]	Average imputed interest rate of 8.5% in 2011 and 8.1% in 2010.

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Long-Term Debt (Condensed Consolidated Statement Of Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Sales and other operating revenue, including sales-based taxes	$ 467,029	[1],[2]	$ 370,125	[1],[2]	$ 301,500	[1],[2]
Income from equity affiliates	15,289		10,677		7,143
Other income	4,111		2,419		1,943
Intercompany revenue
Total revenues and other income	486,429		383,221		310,586
Crude oil and product purchases	266,534		197,959		152,806
Production and manufacturing expenses	40,268		35,792		33,027
Selling, general and administrative expenses	14,983		14,683		14,735
Depreciation and depletion	15,583		14,760		11,917
Exploration expenses, including dry holes	2,081		2,144		2,021
Interest expense	247		259		548
Sales-based taxes	33,503	[2]	28,547	[2]	25,936	[2]
Other taxes and duties	39,973		36,118		34,819
Total costs and other deductions	413,172		330,262		275,809
Income before income taxes	73,257		52,959		34,777
Income taxes	31,051		21,561		15,119
Net income including noncontrolling interests	42,206		31,398		19,658
Net income attributable to noncontrolling interests	1,146		938		378
Net income attributable to ExxonMobil	41,060		30,460		19,280
Exxon Mobil Corporation Parent Guarantor [Member]
Sales and other operating revenue, including sales-based taxes	17,942		15,382		11,352
Income from equity affiliates	39,198		28,401		19,852
Other income	472		790		813
Intercompany revenue	54,891		39,433		30,889
Total revenues and other income	112,503		84,006		62,906
Crude oil and product purchases	57,604		40,788		31,419
Production and manufacturing expenses	7,827		7,627		7,811
Selling, general and administrative expenses	2,936		2,871		2,574
Depreciation and depletion	1,660		1,761		1,571
Exploration expenses, including dry holes	219		251		230
Interest expense	305		217		1,200
Other taxes and duties	40		29		(29)
Total costs and other deductions	70,591		53,544		44,776
Income before income taxes	41,912		30,462		18,130
Income taxes	852		2		(1,150)
Net income including noncontrolling interests	41,060		30,460		19,280
Net income attributable to ExxonMobil	41,060		30,460		19,280
SeaRiver Maritime Financial Holdings, Inc. [Member]
Sales and other operating revenue, including sales-based taxes
Income from equity affiliates	(14)		(2)		7
Other income
Intercompany revenue	3		4		4
Total revenues and other income	(11)		2		11
Crude oil and product purchases
Production and manufacturing expenses
Selling, general and administrative expenses
Depreciation and depletion
Exploration expenses, including dry holes
Interest expense	274		246		222
Sales-based taxes
Other taxes and duties
Total costs and other deductions	274		246		222
Income before income taxes	(285)		(244)		(211)
Income taxes	(101)		(90)		(81)
Net income including noncontrolling interests	(184)		(154)		(130)
Net income attributable to noncontrolling interests
Net income attributable to ExxonMobil	(184)		(154)		(130)
All Other Subsidiaries [Member]
Sales and other operating revenue, including sales-based taxes	449,087		354,743		290,148
Income from equity affiliates	15,196		10,589		7,060
Other income	3,639		1,629		1,130
Intercompany revenue	451,627		332,483		271,663
Total revenues and other income	919,549		699,444		570,001
Crude oil and product purchases	704,125		518,961		411,689
Production and manufacturing expenses	38,234		33,400		30,805
Selling, general and administrative expenses	12,748		12,482		12,852
Depreciation and depletion	13,923		12,999		10,346
Exploration expenses, including dry holes	1,862		1,893		1,791
Interest expense	4,512		4,035		5,126
Sales-based taxes	33,503		28,547		25,936
Other taxes and duties	39,933		36,089		34,848
Total costs and other deductions	848,840		648,406		533,393
Income before income taxes	70,709		51,038		36,608
Income taxes	30,300		21,649		16,350
Net income including noncontrolling interests	40,409		29,389		20,258
Net income attributable to noncontrolling interests	1,146		938		378
Net income attributable to ExxonMobil	39,263		28,451		19,880
Consolidating And Eliminating Adjustments [Member]
Sales and other operating revenue, including sales-based taxes
Income from equity affiliates	(39,091)		(28,311)		(19,776)
Other income
Intercompany revenue	(506,521)		(371,920)		(302,556)
Total revenues and other income	(545,612)		(400,231)		(322,332)
Crude oil and product purchases	(495,195)		(361,790)		(290,302)
Production and manufacturing expenses	(5,793)		(5,235)		(5,589)
Selling, general and administrative expenses	(701)		(670)		(691)
Depreciation and depletion
Exploration expenses, including dry holes
Interest expense	(4,844)		(4,239)		(6,000)
Sales-based taxes
Other taxes and duties
Total costs and other deductions	(506,533)		(371,934)		(302,582)
Income before income taxes	(39,079)		(28,297)		(19,750)
Income taxes
Net income including noncontrolling interests	(39,079)		(28,297)		(19,750)
Net income attributable to noncontrolling interests
Net income attributable to ExxonMobil	$ (39,079)		$ (28,297)		$ (19,750)
[1]	Sales and other operating revenue includes sales-based taxes of $33,503 million for 2011, $28,547 million for 2010 and $25,936 million for 2009. See Note 1, Summary of Accounting Policies.
[2]	Sales and other operating revenue includes sales-based taxes of $33,503 million for 2011, $28,547 million for 2010 and $25,936 million for 2009.

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Long-Term Debt (Condensed Consolidated Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Cash and cash equivalents	$ 12,664	$ 7,825	$ 10,693	$ 31,437
Cash and cash equivalents - restricted	404	628
Notes and accounts receivable - net	38,642	32,284
Inventories	15,024	12,976
Other current assets	6,229	5,271
Total current assets	72,963	58,984
Investments and other assets	43,425	43,978
Property, plant and equipment - net	214,664	199,548	139,116
Other long-term assets	9,092	8,640
Intercompany receivables
Total assets	331,052	302,510	233,323
Notes and loans payable	7,711	2,787
Accounts payable and accrued liabilities	57,067	50,034
Income taxes payable	12,727	9,812
Total current liabilities	77,505	62,633
Long-term debt	9,322	12,227
Postretirement benefits reserves	24,994	19,367
Deferred income tax liabilities	36,618	35,150
Other long-term liabilities	21,869	20,454
Intercompany payables
Total liabilities	170,308	149,831
Earnings reinvested	330,939	298,899
Other equity	(176,543)	(152,060)
ExxonMobil share of equity	154,396	146,839
Noncontrolling interests	6,348	5,840
Total equity	160,744	152,679	115,392	117,523
Total liabilities and equity	331,052	302,510
Exxon Mobil Corporation Parent Guarantor [Member]
Cash and cash equivalents	1,354	309
Cash and cash equivalents - restricted	239	371
Notes and accounts receivable - net	2,719	2,104
Inventories	1,634	1,457
Other current assets	353	239
Total current assets	6,299	4,480
Investments and other assets	260,410	255,005
Property, plant and equipment - net	19,687	18,830
Intercompany receivables	17,325	18,186
Total assets	303,721	296,501
Notes and loans payable	1,851	1,042
Accounts payable and accrued liabilities	3,117	2,987
Total current liabilities	4,968	4,029
Long-term debt	293	295
Postretirement benefits reserves	12,344	9,660
Deferred income tax liabilities	1,450	642
Other long-term liabilities	5,215	5,632
Intercompany payables	125,055	129,404
Total liabilities	149,325	149,662
Earnings reinvested	330,939	298,899
Other equity	(176,543)	(152,060)
ExxonMobil share of equity	154,396	146,839
Total equity	154,396	146,839
Total liabilities and equity	303,721	296,501
SeaRiver Maritime Financial Holdings, Inc. [Member]
Investments and other assets	393	458
Intercompany receivables	2,726	2,457
Total assets	3,119	2,915
Notes and loans payable	2,662	13
Accounts payable and accrued liabilities	57
Income taxes payable	2	3
Total current liabilities	2,721	16
Long-term debt		2,389
Deferred income tax liabilities		107
Intercompany payables	386	382
Total liabilities	3,107	2,894
Earnings reinvested	(1,032)	(848)
Other equity	1,044	869
ExxonMobil share of equity	12	21
Total equity	12	21
Total liabilities and equity	3,119	2,915
All Other Subsidiaries [Member]
Cash and cash equivalents	11,310	7,516
Cash and cash equivalents - restricted	165	257
Notes and accounts receivable - net	36,569	30,346
Inventories	13,390	11,519
Other current assets	5,876	5,032
Total current assets	67,310	54,670
Investments and other assets	485,157	462,893
Property, plant and equipment - net	194,977	180,718
Intercompany receivables	543,844	528,405
Total assets	1,291,288	1,226,686
Notes and loans payable	3,198	1,732
Accounts payable and accrued liabilities	53,893	47,047
Income taxes payable	13,371	9,975
Total current liabilities	70,462	58,754
Long-term debt	9,029	9,543
Postretirement benefits reserves	12,650	9,707
Deferred income tax liabilities	35,168	34,401
Other long-term liabilities	16,654	14,822
Intercompany payables	438,454	419,262
Total liabilities	582,417	546,489
Earnings reinvested	141,467	132,357
Other equity	561,056	542,000
ExxonMobil share of equity	702,523	674,357
Noncontrolling interests	6,348	5,840
Total equity	708,871	680,197
Total liabilities and equity	1,291,288	1,226,686
Consolidating And Eliminating Adjustments [Member]
Notes and accounts receivable - net	(646)	(166)
Total current assets	(646)	(166)
Investments and other assets	(702,535)	(674,378)
Intercompany receivables	(563,895)	(549,048)
Total assets	(1,267,076)	(1,223,592)
Income taxes payable	(646)	(166)
Total current liabilities	(646)	(166)
Intercompany payables	(563,895)	(549,048)
Total liabilities	(564,541)	(549,214)
Earnings reinvested	(140,435)	(131,509)
Other equity	(562,100)	(542,869)
ExxonMobil share of equity	(702,535)	(674,378)
Total equity	(702,535)	(674,378)
Total liabilities and equity	$ (1,267,076)	$ (1,223,592)

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Long-Term Debt (Condensed Consolidated Statement Of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash provided by/(used in) operating activities	$ 55,345	$ 48,413	$ 28,438
Additions to property, plant and equipment	(30,975)	(26,871)	(22,491)
Proceeds associated with sales of long-term assets	11,133	3,261	1,545
Decrease/(increase) in restricted cash and cash equivalents	224	(628)
All other investing, net	(2,547)	34	(1,473)
Net cash provided by/(used in) investing activities	(22,165)	(24,204)	(22,419)
Additions to short- and long-term debt	1,765	1,741	1,561
Reductions in short- and long-term debt	(1,369)	(8,660)	(1,643)
Additions/(reductions) in debt with three months or less maturity	1,561	709	(71)
Cash dividends to ExxonMobil shareholders	(9,020)	(8,498)	(8,023)
Common stock acquired	(22,055)	(13,093)	(19,703)
All other financing, net	862	877	596
Net cash provided by/(used in) financing activities	(28,256)	(26,924)	(27,283)
Effects of exchange rate changes on cash	(85)	(153)	520
Increase/(decrease) in cash and cash equivalents	4,839	(2,868)	(20,744)
Exxon Mobil Corporation Parent Guarantor [Member]
Cash provided by/(used in) operating activities	37,752	35,740	27,424
Additions to property, plant and equipment	(2,516)	(2,922)	(2,686)
Proceeds associated with sales of long-term assets	667	1,484	228
Decrease/(increase) in restricted cash and cash equivalents	132	(371)
Net intercompany investing	(4,227)	(13,966)	(1,826)
All other investing, net	(1,679)	(672)
Net cash provided by/(used in) investing activities	(7,623)	(16,447)	(4,284)
Additions to short- and long-term debt
Reductions in short- and long-term debt	(2)	(3)	(3)
Additions/(reductions) in debt with three months or less maturity	809	997	39
Cash dividends to ExxonMobil shareholders	(9,020)	(8,498)	(8,023)
Common stock acquired	(22,055)	(13,093)	(19,703)
All other financing, net	1,184	1,164	988
Net cash provided by/(used in) financing activities	(29,084)	(19,433)	(26,702)
Increase/(decrease) in cash and cash equivalents	1,045	(140)	(3,562)
SeaRiver Maritime Financial Holdings, Inc. [Member]
Cash provided by/(used in) operating activities	63	63	72
Net intercompany investing	(229)	(200)	(209)
Net cash provided by/(used in) investing activities	(229)	(200)	(209)
Reductions in short- and long-term debt	(13)	(13)	(13)
Net intercompany financing activity	4
All other financing, net	175	150	150
Net cash provided by/(used in) financing activities	166	137	137
All Other Subsidiaries [Member]
Cash provided by/(used in) operating activities	47,683	18,307	28,024
Additions to property, plant and equipment	(28,459)	(23,949)	(19,805)
Proceeds associated with sales of long-term assets	10,466	1,777	1,317
Decrease/(increase) in restricted cash and cash equivalents	92	(257)
Net intercompany investing	4,015	13,813	1,717
All other investing, net	(868)	706	(1,473)
Net cash provided by/(used in) investing activities	(14,754)	(7,910)	(18,244)
Additions to short- and long-term debt	1,765	1,741	1,561
Reductions in short- and long-term debt	(1,354)	(8,644)	(1,627)
Additions/(reductions) in debt with three months or less maturity	752	(288)	(110)
Cash dividends to ExxonMobil shareholders	(30,153)	(5,697)	(27,082)
Net intercompany financing activity	262	202	168
All other financing, net	(322)	(286)	(392)
Net cash provided by/(used in) financing activities	(29,050)	(12,972)	(27,482)
Effects of exchange rate changes on cash	(85)	(153)	520
Increase/(decrease) in cash and cash equivalents	3,794	(2,728)	(17,182)
Consolidating And Eliminating Adjustments [Member]
Cash provided by/(used in) operating activities	(30,153)	(5,697)	(27,082)
Net intercompany investing	441	353	318
Net cash provided by/(used in) investing activities	441	353	318
Cash dividends to ExxonMobil shareholders	30,153	5,697	27,082
Net intercompany financing activity	(266)	(202)	(168)
All other financing, net	(175)	(151)	(150)
Net cash provided by/(used in) financing activities	$ 29,712	$ 5,344	$ 26,764

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Incentive Program (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Minimum ownership of affiliates needed for awards	50.00%
Number of shares issuable under 2003 incentive program, maximum	220,000,000
Remaining shares available for award under 2003 incentive program	133,183,000
Options and stock appreciation rights grant, minimum percentage of market value, date of grant	100.00%
Award grant, maximum life or term, years	10
Cash received from stock option exercises	$ 924	$ 1,043	$ 752
Cash tax benefit realized for options exercised	221	89	164
Aggregate intrinsic value of stock options exercised	986	539	563
Aggregate intrinsic value of stock options exercisable	97
Intrinsic value, outstanding stock options	98
Non-Vested XTO Stock Options [Member]
Compensation cost charged against income	1	2
Unvested converted stock options at period end	226,000
Options that vest ratably	10,000
Options that vest at stock prices	216,000
Options that vest at stock prices, maximum	$ 126.8
Stock Options [Member]
Stock options exercisable, vesting period, years	3
Restricted Stock [Member]
Long-term incentive awards	10,533,000	10,648,000	10,133,000
Award vesting period, first half of awards, years	3
Awards granted to senior executives, vesting periods, first half of awards, years	5
Awards granted to senior executives, vesting periods, remaining awards, years	10
Unrecognized compensation cost	2,168
Unrecognized compensation cost, weighted-average period of recognition, years	4.5
Compensation cost charged against income	793	801	723
Income tax benefit recognized in income	73	81	76
Fair value of shares/awards vested	801	718	763
Cash payments, vested restricted stock units	46	42	41
Award vesting period, maximum	7
Percent of the shares in each award vesting after three years	50.00%
Percent of the shares in each award vesting after seven years	50.00%
Percent of shares in each award vesting after five years	50.00%
Percent of shares in each award vesting in later of ten years or retirement	50.00%
Acquisition Of XTO Energy Inc [Member]
Long-term incentive awards		4,206,000
Fair value of shares/awards vested		182
Value of restricted stock granted		$ 250
Converted stock options granted		12,393,000
Unvested converted stock options at grant date		893,000
Period the majority of converted XTO awards vest over in annual installments minimum, years		3

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Incentive Program (Summary Of Restricted Stock And Units Outstanding) (Details) (Restricted Stock [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Restricted Stock [Member]
Issued and outstanding at January 1, Restricted stock, Shares	47,306
2010 award issued in 2011, Shares	10,639
Vested, Shares	(10,628)
Forfeited, Shares	(536)
Issued and outstanding at December 31, Restricted stock, Shares	46,781
Issued and outstanding at January 1, Weighted Average Grant-Date Fair Value per Share	$ 69.74
2010 award issued in 2011, Weighted Average Grant-Date Fair Value per Share	$ 68.74
Vested, Weighted Average Grant-Date Fair Value per Share	$ 64.37
Forfeited, Weighted Average Grant-Date Fair Value per Share	$ 67.35
Issued and outstanding at December 31, Weighted Average Grant-Date Fair Value per Share	$ 70.76

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Incentive Program (Grant Value Of Restricted Stock And Units) (Details) (Restricted Stock [Member], USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restricted Stock [Member]
Incentive Program [Line Items]
Grant price, per share	$ 79.52	$ 66.07	$ 75.4
Restricted stock and units settled in stock	$ 766	$ 672	$ 711
Merger-related granted and converted XTO awards		250
Units settled in cash	72	60	53
Total value	$ 838	$ 982	$ 764

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Incentive Program (Summary Of Stock Options Outstanding) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Incentive Program [Line Items]
Outstanding at December 31, Weighted Average Remaining Contractual Term, in Years	3
Exercisable at December 31, Weighted Average Remaining Contractual Term, in Years	3
Stock Option [Member]
Incentive Program [Line Items]
Outstanding at January 1, Shares	29,509
Outstanding at January 1, Avg. Exercise Price	$ 44.65
Exercised, shares	(23,880)
Exercised, Avg. Exercise Price	$ 38.81
Forfeited, Shares	(80)
Forfeited, Avg. Exercise Price	$ 48.01
Outstanding at December 31, Shares	5,549
Outstanding at December 31, Avg. Exercise Price	$ 69.76
Exercisable at December 31, Shares	5,323
Exercisable at December 31, Avg. Exercise Price	$ 68.65

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Litigation And Other Contingencies (Narrative) (Details) (USD $)	Dec. 31, 2011	Dec. 23, 2011 days	Jun. 30, 2011 gal	May 01, 2007	Dec. 31, 2011 Equity Company Obligations [Member]	Jun. 27, 2007 Expropriation Of Assets [Member]	Jun. 30, 2011 Compensatory Damages [Member]	Jun. 30, 2011 Punitive Damages [Member]	Feb. 13, 2012 Mobil Cerro Negro, Ltd. (MCN) [Member]	Dec. 23, 2011 Mobil Cerro Negro, Ltd. (MCN) [Member]	Oct. 24, 2011 Production Sharing Contract (PSC) [Member]	Feb. 01, 2012 Settlement Of Litigation [Member] Mobil Cerro Negro, Ltd. (MCN) [Member]	Oct. 24, 2011 Pending Or Threatened Litigation [Member]
Loss Contingencies [Line Items]
Accidental gasoline leak (gallons)			26,000
Litigation court verdict								$ 497,000,000	$ 1,000,000,000
Guarantees	8,456,000,000				4,607,000,000	[1]
Percentage ownership interest in Cerro Negro Project				41.67%			41.67%
Net book investment in Cerro Negro Project	750,000,000
Amount awarded for contractual obligations, before deductions											908,000,000
Amount arbitration award reduced by due to debt owed to PDVSA and PdVSA CN											161,000,000
Arbitration awarded for contractual obligations after debt deducted											747,000,000
Number of days to comply with arbitration verdict		60
Partial payment of arbitration awarded for breach of contractual obligations													305,000,000
Cancellation of bond debt										195,000,000
Percent interest in Erha block PSC												56.25%
Amount of award relating to excess lifting of crude oil														1,800,000,000
Accrued interest relating to award for excess lifting of crude oil														$ 234,000,000
[1]	ExxonMobil share.

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Litigation And Other Contingencies (Schedule Of Guarantees) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Loss Contingencies [Line Items]
Guarantees	$ 8,456
Equity Company Obligations [Member]
Loss Contingencies [Line Items]
Guarantees	4,607	[1]
Other Third-Party Obligations [Member]
Loss Contingencies [Line Items]
Guarantees	3,849
Debt-Related Guarantees [Member]
Loss Contingencies [Line Items]
Guarantees	1,611
Debt-Related Guarantees [Member] | Equity Company Obligations [Member]
Loss Contingencies [Line Items]
Guarantees	1,546	[1]
Debt-Related Guarantees [Member] | Other Third-Party Obligations [Member]
Loss Contingencies [Line Items]
Guarantees	65
Other Guarantees [Member]
Loss Contingencies [Line Items]
Guarantees	6,845
Other Guarantees [Member] | Equity Company Obligations [Member]
Loss Contingencies [Line Items]
Guarantees	3,061	[1]
Other Guarantees [Member] | Other Third-Party Obligations [Member]
Loss Contingencies [Line Items]
Guarantees	$ 3,784
[1]	ExxonMobil share.

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Litigation And Other Contingencies (Schedule Of Unconditional Purchase Obligations) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Loss Contingencies [Line Items]
2012	$ 243	[1]
2013-2016	660	[1]
2017 and Beyond	410	[1]
Total	1,313	[1]
Present value of these commitments	1,084
Undiscounted unconditional purchase obligations	1,313
Imputed interest	229
Equity Company Obligations [Member]
Loss Contingencies [Line Items]
Undiscounted unconditional purchase obligations	$ 856
[1]	Undiscounted obligations of $1,313 million mainly pertain to pipeline throughput agreements and include $856 million of obligations to equity companies. The present value of these commitments, which excludes imputed interest of $229 million, totaled $1,084 million.

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Pension And Other Postretirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	5.50%
Health care cost trend rate projected in 2015	4.50%
Year that rate reaches ultimate trend rate	2015
Effect of one-percentage-point increase on service and interest costs	$ 63
Effect of one-percentage-point increase on postretirement benefit obligation	696
Effect of one-percentage-point decrease on service and interest costs	49
Effect of one-percentage-point decrease on postretirement benefit obligation	567
Costs for defined contribution plans	$ 378	$ 347	$ 339
Pension Benefits - U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, equity securities	50.00%
Target asset allocation, debt securities	50.00%
Target asset allocation, venture capital	5.00%
Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, equity securities	47.00%
Target asset allocation, debt securities	50.00%
Target asset allocation, real estate funds	3.00%
Target asset allocation, venture capital	3.00%

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Pension And Other Postretirement Benefits (Benefit Obligations And Plan Assets Associated With Principal Benefit Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Medicare subsidy receipts	$ 29		$ 15
Pension Benefits - U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.00%		5.50%
Long-term rate of compensation increase	5.75%		5.25%
Benefit obligation at January 1	15,007		13,981
Service cost	546		468		438
Interest cost	792		798		809
Actuarial loss/(gain)	1,954		553
Foreign exchange rate changes
Plan amendments, other			80
Benefit obligation at December 31	17,035		15,007		13,981
Accumulated benefit obligation at December 31	14,081		12,764
Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.00%		4.80%
Long-term rate of compensation increase	5.40%		5.20%
Benefit obligation at January 1	25,722		23,344
Service cost	574		480		421
Interest cost	1,267		1,175		1,121
Actuarial loss/(gain)	3,086		1,672
Foreign exchange rate changes	(303)		169
Plan amendments, other	192		163
Benefit obligation at December 31	29,068		25,722		23,344
Accumulated benefit obligation at December 31	25,480		22,958
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.00%		5.50%
Long-term rate of compensation increase	5.75%		5.25%
Benefit obligation at January 1	7,331		6,748
Service cost	121		101		94
Interest cost	393		395		408
Actuarial loss/(gain)	427		277
Foreign exchange rate changes	(11)		26
Plan amendments, other	92		178
Benefit obligation at December 31	7,880		7,331		6,748
Accumulated benefit obligation at December 31
Benefit Payments For Funded And Unfunded Plans [Member] | Pension Benefits - U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(1,264)	[1],[2]	(873)	[1],[2]
Benefit Payments For Funded And Unfunded Plans [Member] | Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(1,470)	[1],[2]	(1,281)	[1],[2]
Benefit Payments For Funded And Unfunded Plans [Member] | Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ (473)	[1],[2]	$ (394)	[1],[2]
[1]	Benefit payments for funded and unfunded plans.
[2]	For 2011 and 2010, other postretirement benefits paid are net of $29 million and $15 million of Medicare subsidy receipts, respectively.

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Pension And Other Postretirement Benefits (Change In Plan Assets Of Pension And Other Postretirement Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Pension Benefits - U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	$ 10,835		$ 10,277
Actual return on plan assets	505		1,235
Foreign exchange rate changes
Company contribution	370
Other
Fair value at December 31	10,656		10,835
Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	16,765		15,401
Actual return on plan assets	123		1,482
Foreign exchange rate changes	(192)		99
Company contribution	1,623		1,184
Other	(156)		(528)
Fair value at December 31	17,117		16,765
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	558		514
Actual return on plan assets			63
Foreign exchange rate changes
Company contribution	39		38
Other			2
Fair value at December 31	538		558
Benefit Payments For Funded Plans [Member] | Pension Benefits - U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(1,054)	[1]	(677)	[1]
Benefit Payments For Funded Plans [Member] | Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(1,046)	[1]	(873)	[1]
Benefit Payments For Funded Plans [Member] | Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ (59)	[1]	$ (59)	[1]
[1]	Benefit payments for funded plans.

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Pension And Other Postretirement Benefits (Summary Of Assets In Excess Of/(Less Than) Benefit Obligation) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits - U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Funded Status of Plan	$ (6,379)	[1]	$ (4,172)	[1]
Total	(6,379)		(4,172)
Pension Benefits - U.S. [Member] | Funded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Funded Status of Plan	(4,141)		(2,349)
Pension Benefits - U.S. [Member] | Unfunded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Unfunded plans	(2,238)		(1,823)
Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Funded Status of Plan	(11,951)	[1]	(8,957)	[1]
Total	(11,951)		(8,957)
Pension Benefits - Non-U.S. [Member] | Funded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Funded Status of Plan	(5,319)		(2,769)
Pension Benefits - Non-U.S. [Member] | Unfunded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Unfunded plans	$ (6,632)		$ (6,188)
[1]	Fair value of assets less benefit obligation shown on the preceding page.

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Pension And Other Postretirement Benefits (Assets Recorded In Balance Sheet And Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Postretirement benefits reserves	$ (24,994)		$ (19,367)
Pension Benefits - U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Balance at December 31	(6,379)	[1]	(4,172)	[1]
Other assets	1		1
Current liabilities	(237)		(257)
Postretirement benefits reserves	(6,143)		(3,916)
Total recorded	(6,379)		(4,172)
Net actuarial loss/(gain)	6,475		5,028
Prior service cost	74		83
Total recorded in accumulated other comprehensive income	6,549		5,111
Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Balance at December 31	(11,951)	[1]	(8,957)	[1]
Other assets	245		400
Current liabilities	(346)		(336)
Postretirement benefits reserves	(11,850)		(9,021)
Total recorded	(11,951)		(8,957)
Net actuarial loss/(gain)	11,170		7,795
Prior service cost	745		674
Total recorded in accumulated other comprehensive income	11,915		8,469
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Balance at December 31	(7,342)	[1]	(6,773)	[1]
Current liabilities	(341)		(343)
Postretirement benefits reserves	(7,001)		(6,430)
Total recorded	(7,342)		(6,773)
Net actuarial loss/(gain)	2,291		1,985
Prior service cost	119		154
Total recorded in accumulated other comprehensive income	$ 2,410		$ 2,139
[1]	Fair value of assets less benefit obligation shown on the preceding page.

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Pension And Other Postretirement Benefits (Long-Term Rates Of Pension And Other Postretirement Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits - U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.50%	6.00%	6.25%
Long-term rate of return on funded assets	7.50%	7.50%	8.00%
Long-term rate of compensation increase	5.25%	5.25%	5.00%
Service cost	$ 546	$ 468	$ 438
Interest cost	792	798	809
Expected return on plan assets	(769)	(726)	(656)
Amortization of actuarial loss/(gain)	485	525	694
Amortization of prior service cost	9	2
Net pension enhancement and curtailment/settlement expense	286	321	485
Net periodic benefit cost	1,349	1,388	1,770
Net actuarial loss/(gain)	2,218	44	(231)
Amortization of actuarial (loss)/gain	(771)	(846)	(1,179)
Prior service cost/(credit)		80
Amortization of prior service (cost)/credit	(9)	(2)
Total recorded in other comprehensive income	1,438	(724)	(1,410)
Total recorded in net periodic benefit cost and other comprehensive income, before tax	2,787	664	360
Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.80%	5.20%	5.50%
Long-term rate of return on funded assets	6.80%	6.70%	7.30%
Long-term rate of compensation increase	5.20%	5.00%	4.70%
Service cost	574	480	421
Interest cost	1,267	1,175	1,121
Expected return on plan assets	(1,168)	(1,010)	(886)
Amortization of actuarial loss/(gain)	647	554	648
Amortization of prior service cost	103	84	79
Net pension enhancement and curtailment/settlement expense	34	9	2
Net periodic benefit cost	1,457	1,292	1,385
Net actuarial loss/(gain)	4,133	1,202	(33)
Amortization of actuarial (loss)/gain	(681)	(563)	(650)
Prior service cost/(credit)	187	160	69
Amortization of prior service (cost)/credit	(103)	(84)	(79)
Foreign exchange rate changes	(90)	96	608
Total recorded in other comprehensive income	3,446	811	(85)
Total recorded in net periodic benefit cost and other comprehensive income, before tax	4,903	2,103	1,300
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.50%	6.00%	6.25%
Long-term rate of return on funded assets	7.50%	7.50%	8.00%
Long-term rate of compensation increase	5.25%	5.25%	5.00%
Service cost	121	101	94
Interest cost	393	395	408
Expected return on plan assets	(41)	(37)	(35)
Amortization of actuarial loss/(gain)	162	147	176
Amortization of prior service cost	35	52	69
Net periodic benefit cost	670	658	712
Net actuarial loss/(gain)	468	251	(107)
Amortization of actuarial (loss)/gain	(162)	(147)	(176)
Prior service cost/(credit)		26
Amortization of prior service (cost)/credit	(35)	(52)	(69)
Foreign exchange rate changes		2	2
Total recorded in other comprehensive income	271	80	(350)
Total recorded in net periodic benefit cost and other comprehensive income, before tax	$ 941	$ 738	$ 362

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Pension And Other Postretirement Benefits (Summary Of The Change In Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Total (charge)/credit to other comprehensive income, before tax	$ (5,155)	$ (167)	$ 1,845
(Charge)/credit to income tax (see Note 18)	1,495	35	(591)
(Charge)/credit to investment in equity companies	(30)	11	(133)
(Charge)/credit to other comprehensive income including noncontrolling interests, after tax	(3,690)	(121)	1,121
Charge/(credit) to equity of noncontrolling interests	288	95	93
(Charge)/credit to other comprehensive income attributable to ExxonMobil	(3,402)	(26)	1,214
Pension Benefits - U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Total (charge)/credit to other comprehensive income, before tax	(1,438)	724	1,410
Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Total (charge)/credit to other comprehensive income, before tax	(3,446)	(811)	85
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total (charge)/credit to other comprehensive income, before tax	$ (271)	$ (80)	$ 350

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Pension And Other Postretirement Benefits (Fair Value Of Benefit Plan Assets- U.S. Pension) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits - U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Insurance contracts at contract value	$ 23		$ 23
Fair value of plan assets	10,656		10,835		10,277
Pension Benefits - U.S. [Member] | U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,247		2,648
Pension Benefits - U.S. [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,636		3,530
Pension Benefits - U.S. [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	458		408
Pension Benefits - U.S. [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,728		1,152
Pension Benefits - U.S. [Member] | Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,482		2,847
Pension Benefits - U.S. [Member] | Asset-Backed Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11		31
Pension Benefits - U.S. [Member] | Private Mortgages Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			128
Pension Benefits - U.S. [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	71		68
Pension Benefits - U.S. [Member] | Total At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,633		10,812
Pension Benefits - U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			68
Pension Benefits - U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Total At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			68
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,247	[1]	2,648	[1]
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,636	[1]	3,530	[1]
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,728	[2]	1,152	[2]
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,482	[2]	2,847	[2]
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11	[2]	31	[2]
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	71	[3]
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Total At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,175		10,208
Pension Benefits - U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	458	[4]	408	[4]
Pension Benefits - U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private Mortgages Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			128	[5]
Pension Benefits - U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Total At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	458		536
Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Insurance contracts at contract value	152		158
Fair value of plan assets	17,117		16,765		15,401
Pension Benefits - Non-U.S. [Member] | U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,589		2,443
Pension Benefits - Non-U.S. [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,029		6,730
Pension Benefits - Non-U.S. [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	393		315
Pension Benefits - Non-U.S. [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,859		1,631
Pension Benefits - Non-U.S. [Member] | Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,503		4,855
Pension Benefits - Non-U.S. [Member] | Asset-Backed Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	102		98
Pension Benefits - Non-U.S. [Member] | Private Mortgages Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4		4
Pension Benefits - Non-U.S. [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	397		417
Pension Benefits - Non-U.S. [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	89		114
Pension Benefits - Non-U.S. [Member] | Total At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16,965		16,607
Pension Benefits - Non-U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	194	[6]	228	[6]
Pension Benefits - Non-U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	[7]	2	[7]
Pension Benefits - Non-U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	186	[7]	146	[7]
Pension Benefits - Non-U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	76		63
Pension Benefits - Non-U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Total At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	458		439
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,589	[1]	2,443	[1]
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,835	[1]	6,502	[1]
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,857	[2]	1,629	[2]
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,317	[2]	4,709	[2]
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	102	[2]	98	[2]
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13	[8]	51	[8]
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Total At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15,713		15,432
Pension Benefits - Non-U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	393	[4]	315	[4]
Pension Benefits - Non-U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private Mortgages Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	[5]	4	[5]
Pension Benefits - Non-U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	397	[9]	417	[9]
Pension Benefits - Non-U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Total At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 794		$ 736
[1]	For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.
[2]	For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.
[3]	For cash balances held in the form of short-term fund units that are redeemable at the measurement date, the fair value is treated as a Level 2 input.
[4]	For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.
[5]	For private mortgages, fair value is based on proprietary credit spread matrices developed using market data and monthly surveys of active mortgage bankers.
[6]	For non-U.S. equity securities held in separate accounts, fair value is based on observable quoted prices on active exchanges.
[7]	For corporate and government debt securities that are traded on active exchanges, fair value is based on observable quoted prices.
[8]	For cash balances that are subject to withdrawal penalties or other adjustments, the fair value is treated as a Level 2 input.
[9]	For real estate funds, fair value is based on appraised values developed using comparable market transactions.

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Pension And Other Postretirement Benefits (Fair Value Of Benefit Plan Assets- Other Postretirement) (Details) (Other Postretirement Benefits [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 538		$ 558		$ 514
U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	166		180
Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	155		191
Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7		5
Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	77		49
Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	120		117
Asset-Backed Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12		13
Private Mortgages Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			2
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1		1
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			1
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			1
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	531		550
Significant Other Observable Inputs (Level 2) [Member] | U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	166	[1]	180	[1]
Significant Other Observable Inputs (Level 2) [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	155	[1]	191	[1]
Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	77	[2]	49	[2]
Significant Other Observable Inputs (Level 2) [Member] | Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	120	[2]	117	[2]
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12	[2]	13	[2]
Significant Other Observable Inputs (Level 2) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7		7
Significant Unobservable Inputs (Level 3) [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	[3]	5	[3]
Significant Unobservable Inputs (Level 3) [Member] | Private Mortgages Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			$ 2	[4]
[1]	For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.
[2]	For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.
[3]	For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.
[4]	For private mortgages, fair value is based on proprietary credit spread matrices developed using market data and monthly surveys of active mortgage bankers.

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Pension And Other Postretirement Benefits (Change In The Fair Value Of Level 3 Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Pension Benefits - U.S. [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	$ 408	$ 349
Net realized gains/(losses)	1
Net unrealized gains/(losses)	56	47
Net purchases/(sales)	(7)	12
Fair value at December 31	458	408
Pension Benefits - U.S. [Member] | Private Mortgages [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	128	280
Net realized gains/(losses)	5	36
Net unrealized gains/(losses)		(3)
Net purchases/(sales)	(133)	(185)
Fair value at December 31		128
Pension Benefits - Non-U.S. [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	315	239
Net realized gains/(losses)	7	(1)
Net unrealized gains/(losses)	33	26
Net purchases/(sales)	38	51
Fair value at December 31	393	315
Pension Benefits - Non-U.S. [Member] | Private Mortgages [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	4	5
Net realized gains/(losses)		(1)
Net unrealized gains/(losses)		1
Net purchases/(sales)		(1)
Fair value at December 31	4	4
Pension Benefits - Non-U.S. [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	417	413
Net realized gains/(losses)	3
Net unrealized gains/(losses)	6	(4)
Net purchases/(sales)	(29)	8
Fair value at December 31	397	417
Other Postretirement Benefits [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	5	4
Net unrealized gains/(losses)	2	1
Fair value at December 31	7	5
Other Postretirement Benefits [Member] | Private Mortgages [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	2	3
Net realized gains/(losses)		1
Net purchases/(sales)	(2)	(2)
Fair value at December 31		$ 2

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Pension And Other Postretirement Benefits (Pension Plans With Accumulated Benefit Obligation In Excess Of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Pension Benefits - U.S. [Member]	Dec. 31, 2011 Pension Benefits - Non-U.S. [Member]	Dec. 31, 2011 Other Postretirement Benefits [Member]	Dec. 31, 2011 Funded Pension Plans [Member] Pension Benefits - U.S. [Member]	Dec. 31, 2010 Funded Pension Plans [Member] Pension Benefits - U.S. [Member]	Dec. 31, 2011 Funded Pension Plans [Member] Pension Benefits - Non-U.S. [Member]	Dec. 31, 2010 Funded Pension Plans [Member] Pension Benefits - Non-U.S. [Member]	Dec. 31, 2011 Unfunded Pension Plans [Member] Pension Benefits - U.S. [Member]	Dec. 31, 2010 Unfunded Pension Plans [Member] Pension Benefits - U.S. [Member]	Dec. 31, 2011 Unfunded Pension Plans [Member] Pension Benefits - Non-U.S. [Member]	Dec. 31, 2010 Unfunded Pension Plans [Member] Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation							$ 14,797	$ 13,184	$ 17,668	$ 9,865	$ 2,238	$ 1,823	$ 6,632	$ 6,188
Accumulated benefit obligation							12,606	11,383	16,175	9,074	1,475	1,381	5,753	5,413
Fair value of plan assets							10,655	10,834	12,832	7,131
Net actuarial loss/(gain)	1,033	[1]	889	[1]	173	[1]
Prior service cost	$ 7	[2]	$ 109	[2]	$ 34	[2]
[1]	The Corporation amortizes the net balance of actuarial losses/(gains) as a component of net periodic benefit cost over the average remaining service period of active plan participants.
[2]	The Corporation amortizes prior service cost on a straight-line basis as permitted under authoritative guidance for defined benefit pension and other postretirement benefit plans.

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Pension And Other Postretirement Benefits (Expected Contribution Pension Benefits And Other Postretirement Benefits) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Pension Benefits - U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions expected in 2012	$ 1,650
Benefits payments expected in 2012	1,490
Benefits payments expected in 2013	1,579
Benefits payments expected in 2014	1,547
Benefits payments expected in 2015	1,524
Benefits payments expected in 2016	1,489
Benefits payments expected in 2017-2021	6,616
Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions expected in 2012	1,250
Benefits payments expected in 2012	1,342
Benefits payments expected in 2013	1,360
Benefits payments expected in 2014	1,383
Benefits payments expected in 2015	1,418
Benefits payments expected in 2016	1,462
Benefits payments expected in 2017-2021	7,731
Gross Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits payments expected in 2012	442
Benefits payments expected in 2013	458
Benefits payments expected in 2014	472
Benefits payments expected in 2015	485
Benefits payments expected in 2016	497
Benefits payments expected in 2017-2021	2,611
Other Postretirement Benefits Medicare Subsidy Receipt [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits payments expected in 2012	23
Benefits payments expected in 2013	25
Benefits payments expected in 2014	26
Benefits payments expected in 2015	27
Benefits payments expected in 2016	28
Benefits payments expected in 2017-2021	$ 163

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Disclosures About Segments And Related Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Disclosures About Segments And Related Information [Abstract]
Interest related to Valdez punitive damages award			$ 140
Non-debt-related interest expense	$ 165	$ 41	$ 500

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Disclosures About Segments And Related Information (Schedule Of Segments And Related Information) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Earnings after income tax	$ 41,060		$ 30,460		$ 19,280
Earnings of equity companies included above	15,289		10,677		7,143
Sales and other operating revenue	467,029	[1],[2]	370,125	[1],[2]	301,500	[1],[2]
Depreciation and depletion expense	15,583		14,760		11,917
Interest revenue	135		118		179
Interest expense	247		259		548
Income taxes	31,051		21,561		15,119
Additions to property, plant and equipment	33,638		74,156		22,491
Investments in equity companies	16,968		17,429		15,742
Total assets	331,052		302,510		233,323
Upstream U.S. [Member]
Earnings after income tax	5,096		4,272		2,893
Earnings of equity companies included above	2,045		1,261		1,216
Sales and other operating revenue	14,023	[1]	8,895	[1]	3,406	[1]
Intersegment revenue	9,807		8,102		6,718
Depreciation and depletion expense	4,879		3,506		1,768
Interest expense	30		20		38
Income taxes	2,852		2,219		1,451
Additions to property, plant and equipment	10,887		52,300		2,973
Investments in equity companies	2,963		2,636		2,440
Total assets	82,900		76,725		24,940
Upstream Non-U.S. [Member]
Earnings after income tax	29,343		19,825		14,214
Earnings of equity companies included above	11,768		8,415		5,269
Sales and other operating revenue	32,419	[1]	26,046	[1]	21,355	[1]
Intersegment revenue	49,910		39,066		32,982
Depreciation and depletion expense	7,021		7,574		6,376
Interest expense	36		25		27
Income taxes	25,755		18,627		15,183
Additions to property, plant and equipment	18,934		16,937		13,307
Investments in equity companies	8,439		9,625		8,864
Total assets	127,977		115,646		102,372
Downstream U.S. [Member]
Earnings after income tax	2,268		770		(153)
Earnings of equity companies included above	7		23		(102)
Sales and other operating revenue	120,844	[1]	93,599	[1]	76,467	[1]
Intersegment revenue	18,489		13,546		10,168
Depreciation and depletion expense	650		681		687
Interest expense	10		1		10
Income taxes	1,123		360		(164)
Additions to property, plant and equipment	400		888		1,449
Investments in equity companies	210		254		323
Total assets	18,354		18,378		17,493
Downstream Non-U.S. [Member]
Earnings after income tax	2,191		2,797		1,934
Earnings of equity companies included above	353		225		188
Sales and other operating revenue	257,779	[1]	206,042	[1]	173,404	[1]
Intersegment revenue	73,549		52,697		39,190
Depreciation and depletion expense	1,560		1,565		1,665
Interest expense	24		19		18
Income taxes	696		560		(22)
Additions to property, plant and equipment	1,334		1,332		1,447
Investments in equity companies	1,358		1,240		1,190
Total assets	51,132		47,402		45,098
Chemical U.S. [Member]
Earnings after income tax	2,215		2,422		769
Earnings of equity companies included above	198		171		164
Sales and other operating revenue	15,466	[1]	13,402	[1]	9,962	[1]
Intersegment revenue	12,226		9,694		7,185
Depreciation and depletion expense	380		421		400
Interest expense	2		1		4
Income taxes	1,027		736		281
Additions to property, plant and equipment	241		247		294
Investments in equity companies	253		285		259
Total assets	7,245		7,148		7,044
Chemical Non-U.S. [Member]
Earnings after income tax	2,168		2,491		1,540
Earnings of equity companies included above	1,365		1,163		906
Sales and other operating revenue	26,476	[1]	22,119	[1]	16,885	[1]
Intersegment revenue	10,563		8,421		6,947
Depreciation and depletion expense	458		432		457
Interest expense	(1)		4		1
Income taxes	465		347		(182)
Additions to property, plant and equipment	910		1,733		2,553
Investments in equity companies	3,973		3,586		2,873
Total assets	19,862		19,087		17,117
Corporate And Financing [Member]
Earnings after income tax	(2,221)		(2,117)		(1,917)
Earnings of equity companies included above	(447)		(581)		(498)
Sales and other operating revenue	22	[1]	22	[1]	21	[1]
Intersegment revenue	262		282		284
Depreciation and depletion expense	635		581		564
Interest revenue	135		118		179
Interest expense	146		189		450
Income taxes	(867)		(1,288)		(1,428)
Additions to property, plant and equipment	932		719		468
Investments in equity companies	(228)		(197)		(207)
Total assets	$ 23,582		$ 18,124		$ 19,259
[1]	Sales and other operating revenue includes sales-based taxes of $33,503 million for 2011, $28,547 million for 2010 and $25,936 million for 2009. See Note 1, Summary of Accounting Policies.
[2]	Sales and other operating revenue includes sales-based taxes of $33,503 million for 2011, $28,547 million for 2010 and $25,936 million for 2009.

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Disclosures About Segments And Related Information (Schedule Of Geographic Sales And Other Operating Revenue) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Geographic sales and other operating revenue	$ 467,029	[1]	$ 370,125	[1]	$ 301,500	[1]
Sales-based taxes	33,503		28,547		25,936
U.S. [Member]
Geographic sales and other operating revenue	150,343	[1]	115,906	[1]	89,847	[1]
Non-U.S. [Member]
Geographic sales and other operating revenue	316,686	[1]	254,219	[1]	211,653	[1]
Canada [Member]
Geographic sales and other operating revenue	34,626	[1]	27,243	[1]	21,151	[1]
Japan [Member]
Geographic sales and other operating revenue	31,925	[1]	27,143	[1]	22,054	[1]
United Kingdom [Member]
Geographic sales and other operating revenue	34,833	[1]	24,637	[1]	20,293	[1]
Belgium [Member]
Geographic sales and other operating revenue	26,926	[1]	21,139	[1]	16,857	[1]
Germany [Member]
Geographic sales and other operating revenue	17,034	[1]	14,301	[1]	14,839	[1]
Italy [Member]
Geographic sales and other operating revenue	16,288	[1]	14,132	[1]	12,997	[1]
France [Member]
Geographic sales and other operating revenue	18,510	[1]	13,920	[1]	12,042	[1]
Singapore [Member]
Geographic sales and other operating revenue	$ 14,400	[1]	$ 11,088	[1]	$ 8,400	[1]
[1]	Sales and other operating revenue includes sales-based taxes of $33,503 million for 2011, $28,547 million for 2010 and $25,936 million for 2009. See Note 1, Summary of Accounting Policies.

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Disclosures About Segments And Related Information (Schedule Of Long-Lived Assets By Geographic Regions) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Long-lived assets	$ 214,664	$ 199,548	$ 139,116
U.S. [Member]
Long-lived assets	91,146	86,021	37,138
Non-U.S. [Member]
Long-lived assets	123,518	113,527	101,978
Canada [Member]
Long-lived assets	24,458	20,879	15,919
Nigeria [Member]
Long-lived assets	11,806	11,429	11,046
Singapore [Member]
Long-lived assets	9,285	8,610	7,238
Angola [Member]
Long-lived assets	10,395	8,570	7,320
Norway [Member]
Long-lived assets	6,039	6,988	7,251
Australia [Member]
Long-lived assets	9,474	6,570	4,247
United Kingdom [Member]
Long-lived assets	5,008	6,177	7,609
Kazakhstan [Member]
Long-lived assets	$ 7,022	$ 5,938	$ 4,748

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Income, Sales-Based And Other Taxes (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income, Sales-Based And Other Taxes [Abstract]
Net credits/(charges) of deferred income taxes	$ 330,000,000	$ (175,000,000)	$ 9,000,000
Reconciliation between income tax expense and theoretical U.S. tax rate, statutory rate	35.00%	35.00%	35.00%
Indefinitely reinvested, undistributed earnings from subsidiary companies outside the U.S.	47,000,000,000
Potential percentage increase in unrecognized tax benefits	50.00%
Credit of net interest expense on income tax reserves		39,000,000
Interest expense on income tax reserves	62,000,000		135,000,000
Interest payable on income tax reserves	$ 662,000,000	$ 636,000,000

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Income, Sales-Based And Other Taxes (Schedule Of Income, Sales-Based And Other Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income, Sales-Based and Other Taxes [Line Items]
Current	$ 30,396		$ 22,317		$ 14,992
Deferred - net	160		(1,142)		(15)
U.S. tax on non-U.S. operations	15		46		32
Total federal and non-U.S.	30,571		21,221		15,009
State	480		340		110
Total income tax expense	31,051		21,561		15,119
Sales-based taxes	33,503	[1]	28,547	[1]	25,936	[1]
Other taxes and duties	39,973		36,118		34,819
Other taxes and duties included in production and manufacturing expenses	2,767		2,238		2,017
Other taxes and duties included in SG&A expenses	804		771		735
Total other taxes and duties	43,544		39,127		37,571
Total	108,098		89,235		78,626
U.S. [Member]
Income, Sales-Based and Other Taxes [Line Items]
Current	1,547		1,224		(838)
Deferred - net	1,577		49		650
U.S. tax on non-U.S. operations	15		46		32
Total federal and non-U.S.	3,139		1,319		(156)
State	480		340		110
Total income tax expense	3,619		1,659		(46)
Sales-based taxes	5,652		6,182		6,271
Other taxes and duties	1,539		776		581
Other taxes and duties included in production and manufacturing expenses	1,342		1,001		699
Other taxes and duties included in SG&A expenses	181		201		197
Total other taxes and duties	3,062		1,978		1,477
Total	12,333		9,819		7,702
Non-U.S. [Member]
Income, Sales-Based and Other Taxes [Line Items]
Current	28,849		21,093		15,830
Deferred - net	(1,417)		(1,191)		(665)
Total federal and non-U.S.	27,432		19,902		15,165
Total income tax expense	27,432		19,902		15,165
Sales-based taxes	27,851		22,365		19,665
Other taxes and duties	38,434		35,342		34,238
Other taxes and duties included in production and manufacturing expenses	1,425		1,237		1,318
Other taxes and duties included in SG&A expenses	623		570		538
Total other taxes and duties	40,482		37,149		36,094
Total	$ 95,765		$ 79,416		$ 70,924
[1]	Sales and other operating revenue includes sales-based taxes of $33,503 million for 2011, $28,547 million for 2010 and $25,936 million for 2009.

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Income, Sales-Based And Other Taxes (Income Taxes Charged/Credited Directly To Equity) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income, Sales-Based And Other Taxes [Abstract]
Cumulative foreign exchange translation adjustment	$ 89	$ (42)	$ (247)
Net actuarial loss / (gain)	2,016	553	(94)
Amortization of actuarial loss / (gain)	(503)	(609)	(649)
Prior service cost	47	92	20
Amortization of prior service cost	(41)	(45)	(43)
Foreign exchange rate changes	(24)	44	175
Total postretirement benefits reserves adjustment	1,495	35	(591)
Other components of equity	$ 236	$ 246	$ 140

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Income, Sales-Based And Other Taxes (Reconciliation Between Income Tax Expense And Theoretical U.S. Tax) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income, Sales-Based And Other Taxes [Abstract]
United States Income before income taxes	$ 11,511	$ 7,711	$ 2,576
Non-U.S. Income before income taxes	61,746	45,248	32,201
Income before income taxes	73,257	52,959	34,777
Theoretical tax	25,640	18,536	12,172
Effect of equity method of accounting	(5,351)	(3,737)	(2,500)
Non-U.S. taxes in excess of theoretical U.S. tax	10,385	7,293	5,948
U.S. tax on non-U.S. operations	15	46	32
State taxes, net of federal tax benefit	312	221	72
Other U.S.	50	(798)	(605)
Total income tax expense	31,051	21,561	15,119
ExxonMobil share of equity company income taxes	5,603	4,058	2,489
Total income taxes	36,654	25,619	17,608
Net income including noncontrolling interests	42,206	31,398	19,658
Total income before taxes	$ 78,860	$ 57,017	$ 37,266
Effective income tax rate	46.00%	45.00%	47.00%

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Income, Sales-Based And Other Taxes (Deferred Income Taxes Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income, Sales-Based And Other Taxes [Abstract]
Property, plant and equipment	$ 45,951	$ 42,657
Other liabilities	4,281	4,278
Total deferred tax liabilities	50,232	46,935
Pension and other postretirement benefits	(7,930)	(5,634)
Asset retirement obligations	(5,302)	(4,461)
Tax loss carryforwards	(3,166)	(3,243)
Other assets	(7,079)	(6,070)
Total deferred tax assets	(23,477)	(19,408)
Asset valuation allowances	1,304	1,183
Net deferred tax liabilities	$ 28,059	$ 28,710

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Income, Sales-Based And Other Taxes (Deferred Income Tax (Assets) And Liabilities By Balance Sheet Classification) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income, Sales-Based and Other Taxes [Line Items]
Other current assets	$ (6,229)	$ (5,271)
Other assets, including intangibles, net	(9,092)	(8,640)
Accounts payable and accrued liabilities	57,067	50,034
Deferred income tax liabilities	36,618	35,150
Net deferred tax liabilities	28,059	28,710
Deferred Taxes [Member]
Income, Sales-Based and Other Taxes [Line Items]
Other current assets	(4,549)	(3,359)
Other assets, including intangibles, net	(4,218)	(3,527)
Accounts payable and accrued liabilities	208	446
Deferred income tax liabilities	36,618	35,150
Net deferred tax liabilities	$ 28,059	$ 28,710

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Income, Sales-Based And Other Taxes (Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income, Sales-Based And Other Taxes [Abstract]
Balance at January 1	$ 4,148	$ 4,725	$ 4,976
Additions based on current year's tax positions	822	830	547
Additions for prior years' tax positions	451	620	262
Reductions for prior years' tax positions	(329)	(505)	(594)
Reductions due to lapse of the statute of limitations		(534)
Settlements with tax authorities	(145)	(999)	(592)
Foreign exchange effects / other	(25)	11	126
Balance at December 31	$ 4,922	$ 4,148	$ 4,725

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Income, Sales-Based And Other Taxes (Remaining Tax Years Subject To Examination By Major Tax Jurisdiction) (Details)	12 Months Ended
Dec. 31, 2011
Abu Dhabi [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	2000 - 2011
Angola [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	2007 - 2011
Australia [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	2000 - 2011
Canada [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	1994 - 2011
Equatorial Guinea [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	2006 - 2011
Germany [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	1999 - 2011
Japan [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	2004 - 2011
Malaysia [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	2005 - 2011
Nigeria [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	1998 - 2011
Norway [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	2000 - 2011
United Kingdom [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	2009 - 2011
United States [Member]
Income, Sales-Based and Other Taxes [Line Items]
Open Tax Years by major tax jurisdiction	2004 - 2011

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Acquisition Of XTO Energy Inc. (Narrative) (Details) (USD $) In Billions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Acquisition Of XTO Energy Inc. [Abstract]
Business acquisition, effective date of acquisition	2010/06/25
Exchange ratio, number of common ExxonMobil shares converted from each share of XTO common stock		0.7098
Unaudited pro forma revenues		$ 373
Net income attributable to ExxonMobil		$ 31
Earnings per common share		$ 6.03
Earnings per common share - assuming dilution		$ 6.01

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Acquisition Of XTO Energy Inc. (Components Of Consideration Transferred In Merger Of XTO Energy Inc.) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended
Jun. 25, 2010	Dec. 31, 2010
Acquisition Of XTO Energy Inc. [Abstract]
Consideration attributable to stock issued	$ 24,480	[1],[2]
Consideration attributable to converted stock options	179	[2]
Total consideration transferred	24,659		24,659
Common stock fair market value per share	$ 59.1
Stock issued during period, shares, treasury stock reissued	416
Stock issued during period, value, treasury stock reissued	21,139
Excess fair value over cost of treasury stock issued used in XTO acquisition	$ 3,520
[1]	The fair value of the Corporation's common stock on the acquisition date was $59.10 per share based on the closing value on the NYSE. The Corporation issued 416 million shares of stock previously held in treasury. The treasury stock issued, based on the average cost, was valued at $21,139 million. The excess of the fair value of the consideration transferred over the cost of treasury stock issued was $3,520 million and was included in common stock without par value.
[2]	The portion of the fair value of XTO converted stock-based awards attributable to pre-merger employee service was part of consideration. The remaining fair value of the awards is recognized over the requisite service period.

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Acquisition Of XTO Energy Inc. (Recording Of Assets Acquired And Liabilities Assumed In Merger Of XTO Energy Inc.) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
Jun. 25, 2010
Acquisition Of XTO Energy Inc. [Abstract]
Current assets	$ 2,053
Property, plant and equipment	47,300	[1]
Goodwill	39	[2]
Other assets	620
Total assets acquired	50,012
Current liabilities	2,615
Long-term debt	10,574	[3]
Deferred income tax liabilities	11,204	[4]
Other long-term obligations	960
Total liabilities assumed	25,353
Net assets acquired	$ 24,659
Risk adjusted discount rate for PP&E fair value measurement	7.00%
Inflation rate for PP&E fair value measurement	2.00%
[1]	Property, plant and equipment were measured primarily using an income approach. The fair value measurements of the oil and gas assets were based, in part, on significant inputs not observable in the market and thus represent a Level 3 measurement. The significant inputs included XTO resources, assumed future production profiles, commodity prices (mainly based on observable market inputs), risk adjusted discount rate of 7 percent, inflation of 2 percent and assumptions on the timing and amount of future development and operating costs. The property, plant and equipment additions were segmented to the Upstream business, with substantially all of the assets in the United States.
[2]	Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill was recognized in the Upstream reporting unit. Goodwill is not amortized and is not deductible for tax purposes.
[3]	Long-term debt was recognized at market rates at closing (Level 1).
[4]	Deferred income taxes reflect the temporary differences between the amount of assets and liabilities recognized for financial reporting purposes and such amounts recognized for tax purposes.

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Subsequent Event (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
Jan. 31, 2012
Subsequent Event [Abstract]
Corporation's ownership percentage of TonenGeneral Sekiyu K.K.	50.00%
Payment for shares of ExxonMobil Yugen Kaisha (ExxonMobil wholly-own parent of TonenGeneral)	$ 3,900
Shares of TonenGeneral owned by ExxonMobil Yugen Kaisha when sold	200
Corporation's ownership percentage of TonenGeneral after Tonen Geneal acquistion of ExxonMobil Yugen Kaisha	22.00%

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Subsequent Event (Major Classes Of Assets And Liabilities Classified As Held For Sale) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Current assets	$ 72,963		$ 58,984
Property, plant and equipment - net	214,664		199,548	139,116
Total assets	331,052		302,510	233,323
Current Liabilities	77,505		62,633
Postretirement benefits reserves	24,994		19,367
Other long-term obligations	21,869		20,454
Total liabilities	170,308		149,831
ExxonMobil share of equity	154,396		146,839
Noncontrolling interests	6,348		5,840
Total equity	160,744		152,679	115,392	117,523
Total liabilities and equity	331,052		302,510
Crude oil, products and merchandise inventory	1,882
Total accumulated comprehensive income	1,482
Sale [Member] | Under Held For Sale Accounting Criteria [Member]
Current assets	6,862	[1]
Property, plant and equipment - net	4,740
Other Assets	1,757
Total assets	13,359
Current Liabilities	8,450
Postretirement benefits reserves	2,103
Other long-term obligations	1,179
Total liabilities	11,732
ExxonMobil share of equity	(467)	[2]
Noncontrolling interests	2,094
Total equity	1,627
Total liabilities and equity	$ 13,359
[1]	Current assets include $1,882 million of crude oil, products and merchandise inventory.
[2]	On the date the Corporation transfers control to TG, the ExxonMobil share of accumulated other comprehensive income will be recycled as a benefit to earnings. At December 31, 2011, the total accumulated other comprehensive income was $1,482 million.

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