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Must be disclosed if the amount (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph a falsefalse68false0us-gaap_SegmentReportingInformationAssetsus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1908700000019087falsefalsefalsefalsefalse2truefalsefalse1711700000017117falsefalsefalsefalsefalse3truefalsefalse1330000000013300falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of total assets attributed to the reportable segment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 falsefalse69false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.exxonmobil.com/taxonomy/role/disclosuredisclosuresaboutsegmentsandrelatedinformationscheduleofsegmentsandrelatedinformationdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse22falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : Corporate and Financing [Member] 1/1/2010 - 12/31/2010 USD ($) $Duration_1_1_2010_To_12_31_20102323http://www.sec.gov/CIK0000034088duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseCorporate and Financing [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldixom_CorporateAndFinancingMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$23falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : Corporate and Financing [Member] 1/1/2009 - 12/31/2009 USD ($) $Duration_1_1_2009_To_12_31_200995http://www.sec.gov/CIK0000034088duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseCorporate and Financing [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldixom_CorporateAndFinancingMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$24falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : Corporate and Financing [Member] 1/1/2008 - 12/31/2008 USD ($) $Duration_1_1_2008_To_12_31_200831http://www.sec.gov/CIK0000034088duration2008-01-01T00:00:002008-12-31T00:00:00falsefalseCorporate and Financing [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldixom_CorporateAndFinancingMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse70false0us-gaap_SegmentReportingInformationProfitLossus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse-2117000000-2117falsefalsefalsefalsefalse2truefalsefalse-1917000000-1917falsefalsefalsefalsefalse3truefalsefalse-1290000000-1290falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of profit or loss recognized by the reportable segment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 falsefalse71false0us-gaap_SegmentReportingInformationEquityInNetIncomeOfEquityMethodInvesteesOfSegmentus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-581000000-581falsefalsefalsefalsefalse2truefalsefalse-498000000-498falsefalsefalsefalsefalse3truefalsefalse-502000000-502falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of income or loss recognized by the reportable segment for its share of an investee's net income or loss reported under the equity method of accounting. 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Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a falsefalse73false0us-gaap_SegmentReportingInformationIntersegmentRevenueus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse282000000282falsefalsefalsefalsefalse2truefalsefalse284000000284falsefalsefalsefalsefalse3truefalsefalse273000000273falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of revenue from transactions with other operating segments of the same entity. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph b falsefalse74false0us-gaap_SegmentReportingInformationDepreciationDepletionAndAmortizationExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse581000000581falsefalsefalsefalsefalse2truefalsefalse564000000564falsefalsefalsefalsefalse3truefalsefalse562000000562falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of depreciation, depletion, and amortization expense for the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph e falsefalse75false0us-gaap_SegmentReportingInformationInterestIncomeus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse118000000118falsefalsefalsefalsefalse2truefalsefalse179000000179falsefalsefalsefalsefalse3truefalsefalse14000000001400falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of interest revenue for the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph c falsefalse76false0us-gaap_SegmentReportingInformationInterestExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse189000000189falsefalsefalsefalsefalse2truefalsefalse450000000450falsefalsefalsefalsefalse3truefalsefalse519000000519falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of interest expense for the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph d falsefalse77false0us-gaap_SegmentReportingInformationIncomeTaxExpenseBenefitus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-1288000000-1288falsefalsefalsefalsefalse2truefalsefalse-1428000000-1428falsefalsefalsefalsefalse3truefalsefalse-480000000-480falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of income tax expense or benefit attributed to the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph h falsefalse78false0xom_SegmentReportingInformationAdditionsToPropertyPlantAndEquipmentxomfalsedebitdurationSegment Reporting Information Additions To Property Plant And Equipmentfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse719000000719falsefalsefalsefalsefalse2truefalsefalse468000000468falsefalsefalsefalsefalse3truefalsefalse572000000572falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySegment Reporting Information Additions To Property Plant And EquipmentNo authoritative reference available.falsefalse79false0us-gaap_SegmentReportingInformationInvestmentInEquityMethodInvesteesus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-197000000-197falsefalsefalsefalsefalse2truefalsefalse-207000000-207falsefalsefalsefalsefalse3truefalsefalse-40000000-40falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of investment in an equity method investee of the reportable segment. Must be disclosed if the amount (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph a falsefalse80false0us-gaap_SegmentReportingInformationAssetsus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1812400000018124falsefalsefalsefalsefalse2truefalsefalse1925900000019259falsefalsefalsefalsefalse3truefalsefalse4271800000042718falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of total assets attributed to the reportable segment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 falsefalse81false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.exxonmobil.com/taxonomy/role/disclosuredisclosuresaboutsegmentsandrelatedinformationscheduleofsegmentsandrelatedinformationdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse25falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : Corporate Total [Member] 1/1/2010 - 12/31/2010 USD ($) $Duration_1_1_2010_To_12_31_20102324http://www.sec.gov/CIK0000034088duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseCorporate Total [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldixom_CorporateTotalMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$26falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : Corporate Total [Member] 1/1/2009 - 12/31/2009 USD ($) $Duration_1_1_2009_To_12_31_200996http://www.sec.gov/CIK0000034088duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseCorporate Total [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldixom_CorporateTotalMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$27falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : Corporate Total [Member] 1/1/2008 - 12/31/2008 USD ($) $Duration_1_1_2008_To_12_31_200832http://www.sec.gov/CIK0000034088duration2008-01-01T00:00:002008-12-31T00:00:00falsefalseCorporate Total [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldixom_CorporateTotalMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse82false0us-gaap_SegmentReportingInformationProfitLossus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse3046000000030460falsefalsefalsefalsefalse2truefalsefalse1928000000019280falsefalsefalsefalsefalse3truefalsefalse4522000000045220falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of profit or loss recognized by the reportable segment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 falsefalse83false0us-gaap_SegmentReportingInformationEquityInNetIncomeOfEquityMethodInvesteesOfSegmentus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1067700000010677falsefalsefalsefalsefalse2truefalsefalse71430000007143falsefalsefalsefalsefalse3truefalsefalse1108100000011081falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of income or loss recognized by the reportable segment for its share of an investee's net income or loss reported under the equity method of accounting. 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Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a falsefalse85false0us-gaap_SegmentReportingInformationDepreciationDepletionAndAmortizationExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1476000000014760falsefalsefalsefalsefalse2truefalsefalse1191700000011917falsefalsefalsefalsefalse3truefalsefalse1237900000012379falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of depreciation, depletion, and amortization expense for the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph e falsefalse86false0us-gaap_SegmentReportingInformationInterestIncomeus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse118000000118falsefalsefalsefalsefalse2truefalsefalse179000000179falsefalsefalsefalsefalse3truefalsefalse14000000001400falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of interest revenue for the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph c falsefalse87false0us-gaap_SegmentReportingInformationInterestExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse259000000259falsefalsefalsefalsefalse2truefalsefalse548000000548falsefalsefalsefalsefalse3truefalsefalse673000000673falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of interest expense for the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph d falsefalse88false0us-gaap_SegmentReportingInformationIncomeTaxExpenseBenefitus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse2156100000021561falsefalsefalsefalsefalse2truefalsefalse1511900000015119falsefalsefalsefalsefalse3truefalsefalse3653000000036530falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of income tax expense or benefit attributed to the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph h falsefalse89false0xom_SegmentReportingInformationAdditionsToPropertyPlantAndEquipmentxomfalsedebitdurationSegment Reporting Information Additions To Property Plant And Equipmentfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse7415600000074156falsefalsefalsefalsefalse2truefalsefalse2249100000022491falsefalsefalsefalsefalse3truefalsefalse1931800000019318falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySegment Reporting Information Additions To Property Plant And EquipmentNo authoritative reference available.falsefalse90false0us-gaap_SegmentReportingInformationInvestmentInEquityMethodInvesteesus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1742900000017429falsefalsefalsefalsefalse2truefalsefalse1574200000015742falsefalsefalsefalsefalse3truefalsefalse1445800000014458falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of investment in an equity method investee of the reportable segment. Must be disclosed if the amount (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph a falsefalse91false0us-gaap_SegmentReportingInformationAssetsus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse302510000000302510falsetruefalsefalsefalse2truefalsefalse233323000000233323falsetruefalsefalsefalse3truefalsefalse228052000000228052falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of total assets attributed to the reportable segment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 falsefalse1Sales and other operating revenue includes sales-based taxes of $28,547 million for 2010, $25,936 million for 2009 and $34,508 million for 2008. 390Disclosures about Segments and Related Information (Schedule of Segments and Related Information) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue