2.2.0.25truefalse40801 - Disclosure - Property, Plant and Equipment and Asset Retirement Obligations (Narrative) (Details)truefalseIn Millions, unless otherwise specifiedfalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010
USD ($)
USD ($) / shares
$Duration_1_1_2010_To_12_31_2010http://www.sec.gov/CIK0000034088duration2010-01-01T00:00:002010-12-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit13Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit15Standardhttp://xbrl.us/us-types/2009-01-31cubicFeetxbrlus0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2009 - 12/31/2009
USD ($)
USD ($) / shares
$Duration_1_1_2009_To_12_31_2009http://www.sec.gov/CIK0000034088duration2009-01-01T00:00:002009-12-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit13Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3falsefalseUSDfalsefalse1/1/2008 - 12/31/2008
USD ($)
USD ($) / shares
$Duration_1_1_2008_To_12_31_2008http://www.sec.gov/CIK0000034088duration2008-01-01T00:00:002008-12-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit13Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2false0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse174390000000174390falsetruefalsefalsefalse2truefalsefalse166790000000166790falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 5
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 5
-Subparagraph c
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 14
-Article 5
falsefalse3false0us-gaap_InterestCostsCapitalizedus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse532000000532falsetruefalsefalsefalse2truefalsefalse425000000425falsetruefalsefalsefalse3truefalsefalse510000000510falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of interest that was capitalized during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 34
-Paragraph 21
-Subparagraph b
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{us-gaap_PropertyPlantAndEquipmentByTypeAxis} : Downstream [Member]
1/1/2010 - 12/31/2010
Duration_1_1_2010_To_12_31_201022222222http://www.sec.gov/CIK0000034088duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseRefinery and Lubes Basestock [Member]xom_PropertyPlantAndEquipmentAdditionalDisclosuresAxisxbrldihttp://xbrl.org/2006/xbrldixom_RefineryAndLubesBasestockMemberxom_PropertyPlantAndEquipmentAdditionalDisclosuresAxisexplicitMemberfalsefalseDownstream [Member]us-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldixom_DownstreamMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMemberUnit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse5false0us-gaap_PropertyPlantAndEquipmentUsefulLifeAverageus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2525falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalThe average useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land and improvements, buildings, and production equipment.No authoritative reference available.falsefalse6false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.exxonmobil.com/taxonomy/role/disclosurepropertyplantandequipmentandassetretirementobligationsnarrativedetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse5falsefalsetruefalse{xom_PropertyPlantAndEquipmentAdditionalDisclosuresAxis} : Service Station Buildings And Fixed Improvements [Member]
{us-gaap_PropertyPlantAndEquipmentByTypeAxis} : Downstream [Member]
1/1/2010 - 12/31/2010
Duration_1_1_2010_To_12_31_201022222223http://www.sec.gov/CIK0000034088duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseService Station Buildings And Fixed Improvements [Member]xom_PropertyPlantAndEquipmentAdditionalDisclosuresAxisxbrldihttp://xbrl.org/2006/xbrldixom_ServiceStationBuildingsAndFixedImprovementsMemberxom_PropertyPlantAndEquipmentAdditionalDisclosuresAxisexplicitMemberfalsefalseDownstream [Member]us-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldixom_DownstreamMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMemberUnit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse7false0us-gaap_PropertyPlantAndEquipmentUsefulLifeAverageus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2020falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalThe average useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land and improvements, buildings, and production equipment.No authoritative reference available.falsefalse8false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.exxonmobil.com/taxonomy/role/disclosurepropertyplantandequipmentandassetretirementobligationsnarrativedetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse6falsefalsetruefalse{xom_PropertyPlantAndEquipmentAdditionalDisclosuresAxis} : Chemical [Member]
{us-gaap_PropertyPlantAndEquipmentByTypeAxis} : Investments In Process Equipment [Member]
1/1/2010 - 12/31/2010
Duration_1_1_2010_To_12_31_201022222224http://www.sec.gov/CIK0000034088duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseChemical [Member]xom_PropertyPlantAndEquipmentAdditionalDisclosuresAxisxbrldihttp://xbrl.org/2006/xbrldixom_ChemicalMemberxom_PropertyPlantAndEquipmentAdditionalDisclosuresAxisexplicitMemberfalsefalseInvestments In Process Equipment [Member]us-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldixom_InvestmentsInProcessEquipmentMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMemberUnit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse9false0us-gaap_PropertyPlantAndEquipmentUsefulLifeAverageus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2020falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalThe average useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land and improvements, buildings, and production equipment.No authoritative reference available.falsefalse38Property, Plant and Equipment and Asset Retirement Obligations (Narrative) (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruetrue
