Condensed Consolidating Financial Information Related To Guaranteed Securities Issued By Subsidiaries (Schedule Of Condensed Consolidated Balance Sheet) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009
Cash and cash equivalents	$ 11,022	$ 7,825	$ 12,244	$ 10,693
Cash and cash equivalents - restricted	233	628
Notes and accounts receivable - net	34,368	32,284
Inventories	16,730	12,976
Other current assets	7,023	5,271
Total current assets	69,376	58,984
Property, plant and equipment - net	209,194	199,548
Investments and other assets	44,657	43,978
Total assets	323,227	302,510
Notes and loans payable	7,431	2,787
Accounts payable and accrued liabilities	54,572	50,034
Income taxes payable	12,968	9,812
Total current liabilities	74,971	62,633
Long-term debt	9,331	12,227
Postretirement benefits reserves	19,557	19,367
Deferred income tax liabilities	36,891	35,150
Other long-term obligations	20,265	20,454
Total liabilities	161,015	149,831
Earnings reinvested	323,786	298,899
Other ExxonMobil equity	(167,847)	(152,060)
ExxonMobil share of equity	155,939	146,839
Noncontrolling interests	6,273	5,840
Total equity	162,212	152,679	150,600	115,392
Total liabilities and equity	323,227	302,510
ExxonMobil Corporation Parent Guarantor [Member]
Cash and cash equivalents	1,000	309
Cash and cash equivalents - restricted	13	371
Notes and accounts receivable - net	3,301	2,104
Inventories	1,762	1,457
Other current assets	521	239
Total current assets	6,597	4,480
Property, plant and equipment - net	19,398	18,830
Investments and other assets	283,235	255,005
Intercompany receivables	16,237	18,186
Total assets	325,467	296,501
Notes and loans payable	1,960	1,042
Accounts payable and accrued liabilities	3,477	2,987
Total current liabilities	5,437	4,029
Long-term debt	294	295
Postretirement benefits reserves	9,853	9,660
Deferred income tax liabilities	1,171	642
Other long-term obligations	4,964	5,632
Intercompany payables	147,809	129,404
Total liabilities	169,528	149,662
Earnings reinvested	323,786	298,899
Other ExxonMobil equity	(167,847)	(152,060)
ExxonMobil share of equity	155,939	146,839
Total equity	155,939	146,839
Total liabilities and equity	325,467	296,501
SeaRiver Maritime Financial Holdings Inc. [Member]
Notes and accounts receivable - net	39
Total current assets	39
Investments and other assets	395	458
Intercompany receivables	2,674	2,457
Total assets	3,108	2,915
Notes and loans payable	2,607	13
Accounts payable and accrued liabilities	73
Income taxes payable		3
Total current liabilities	2,680	16
Long-term debt		2,389
Deferred income tax liabilities		107
Intercompany payables	381	382
Total liabilities	3,061	2,894
Earnings reinvested	(997)	(848)
Other ExxonMobil equity	1,044	869
ExxonMobil share of equity	47	21
Total equity	47	21
Total liabilities and equity	3,108	2,915
All Other Subsidiaries [Member]
Cash and cash equivalents	10,022	7,516
Cash and cash equivalents - restricted	220	257
Notes and accounts receivable - net	32,289	30,346
Inventories	14,968	11,519
Other current assets	6,502	5,032
Total current assets	64,001	54,670
Property, plant and equipment - net	189,796	180,718
Investments and other assets	484,672	462,893
Intercompany receivables	591,366	528,405
Total assets	1,329,835	1,226,686
Notes and loans payable	2,864	1,732
Accounts payable and accrued liabilities	51,022	47,047
Income taxes payable	14,229	9,975
Total current liabilities	68,115	58,754
Long-term debt	9,037	9,543
Postretirement benefits reserves	9,704	9,707
Deferred income tax liabilities	35,720	34,401
Other long-term obligations	15,301	14,822
Intercompany payables	462,087	419,262
Total liabilities	599,964	546,489
Earnings reinvested	161,935	132,357
Other ExxonMobil equity	561,663	542,000
ExxonMobil share of equity	723,598	674,357
Noncontrolling interests	6,273	5,840
Total equity	729,871	680,197
Total liabilities and equity	1,329,835	1,226,686
Consolidating And Eliminating Adjustments [Member]
Notes and accounts receivable - net	(1,261)	(166)
Total current assets	(1,261)	(166)
Investments and other assets	(723,645)	(674,378)
Intercompany receivables	(610,277)	(549,048)
Total assets	(1,335,183)	(1,223,592)
Income taxes payable	(1,261)	(166)
Total current liabilities	(1,261)	(166)
Intercompany payables	(610,277)	(549,048)
Total liabilities	(611,538)	(549,214)
Earnings reinvested	(160,938)	(131,509)
Other ExxonMobil equity	(562,707)	(542,869)
ExxonMobil share of equity	(723,645)	(674,378)
Total equity	(723,645)	(674,378)
Total liabilities and equity	$ (1,335,183)	$ (1,223,592)

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682