2.2.0.25truefalse41503 - Disclosure - Litigation and Other Contingencies (Schedule of Unconditional Purchase Obligations) (Details)truefalseIn Millionsfalse1falsefalseUSDfalsefalse12/31/2010
USD ($)
USD ($) / shares
$As_Of_12_31_2010http://www.sec.gov/CIK0000034088instant2010-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2false0xom_UnconditionalPurchaseObligationDueWithinOneYearxomfalsecreditinstantUnconditional Purchase Obligation Due Within One Yearfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse287000000287[1]falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryUnconditional Purchase Obligation Due Within One YearNo authoritative reference available.falsefalse3false0xom_UnconditionalPurchaseObligationDueAfterOneYearAndWithinFiveYearsxomfalsecreditinstantUnconditional Purchase Obligation Due After One Year And Within Five Yearsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse748000000748[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryUnconditional Purchase Obligation Due After One Year And Within Five YearsNo authoritative reference available.falsefalse4false0xom_UnconditionalPurchaseObligationDueAfterFifthYearxomfalsecreditinstantUnconditional Purchase Obligation Due After Fifth Yearfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse487000000487[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryUnconditional Purchase Obligation Due After Fifth YearNo authoritative reference available.falsefalse5false0xom_UnconditionalPurchaseObligationxomfalsecreditinstantUnconditional Purchase Obligationfalsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse15220000001522[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryUnconditional Purchase ObligationNo authoritative reference available.truefalse6false0xom_UnconditionalPurchaseObligationxomfalsecreditinstantUnconditional Purchase Obligationfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse15220000001522[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryUnconditional Purchase ObligationNo authoritative reference available.falsefalse7false0xom_UnconditionalPurchaseObligationExcludesImputedInterestxomfalsecreditinstantUnconditional Purchase Obligation Excludes Imputed Interestfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse273000000273falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryUnconditional Purchase Obligation Excludes Imputed InterestNo authoritative reference available.falsefalse8false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.exxonmobil.com/taxonomy/role/disclosurelitigationandothercontingenciesscheduleofunconditionalpurchaseobligationsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalseUSDtruefalse{us-gaap_LossContingenciesByNatureOfContingencyAxis} : Equity Company Obligations [Member]
12/31/2010
USD ($)
$As_Of_12_31_2010844http://www.sec.gov/CIK0000034088instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseEquity Company Obligations [Member]us-gaap_LossContingenciesByNatureOfContingencyAxisxbrldihttp://xbrl.org/2006/xbrldixom_EquityCompanyObligationsMemberus-gaap_LossContingenciesByNatureOfContingencyAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse9false0xom_UnconditionalPurchaseObligationxomfalsecreditinstantUnconditional Purchase Obligationfalsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse996000000996falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryUnconditional Purchase ObligationNo authoritative reference available.truefalse10false0xom_UnconditionalPurchaseObligationxomfalsecreditinstantUnconditional Purchase Obligationfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse996000000996falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryUnconditional Purchase ObligationNo authoritative reference available.falsefalse11false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.exxonmobil.com/taxonomy/role/disclosurelitigationandothercontingenciesscheduleofunconditionalpurchaseobligationsdetails1falsefalsefalse00falsefalsefalsefalsefalse3falsefalseUSDtruefalse{us-gaap_LossContingenciesByNatureOfContingencyAxis} : Total Obligations [Member]
12/31/2010
USD ($)
$As_Of_12_31_2010323http://www.sec.gov/CIK0000034088instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTotal Obligations [Member]us-gaap_LossContingenciesByNatureOfContingencyAxisxbrldihttp://xbrl.org/2006/xbrldixom_TotalObligationsMemberus-gaap_LossContingenciesByNatureOfContingencyAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse12false0xom_PresentValueUnconditionalPurchaseObligationxomfalsecreditinstantPresent Value Unconditional Purchase Obligationfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse12490000001249falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryPresent Value Unconditional Purchase ObligationNo authoritative reference available.falsefalse1Undiscounted obligations of $1,522 million mainly pertain to pipeline throughput agreements and include $996 million of obligations to equity companies. The present value of these commitments, which excludes imputed interest of $273 million, totaled $1,249 million. 111Litigation and Other Contingencies (Schedule of Unconditional Purchase Obligations) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
