2.2.0.25truefalse40903 - Disclosure - Accounting for Suspended Exploratory Well Costs (Schedule of Period End Capitalized Suspended Exploratory Well Costs) (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$2falsefalseUSDfalsefalse12/31/2009
USD ($)
USD ($) / shares
$As_Of_12_31_2009http://www.sec.gov/CIK0000034088instant2009-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3falsefalseUSDfalsefalse12/31/2008
USD ($)
$As_Of_12_31_2008http://www.sec.gov/CIK0000034088instant2008-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDfalsefalse12/31/2007
USD ($)
$As_Of_12_31_2007http://www.sec.gov/CIK0000034088instant2007-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false0us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLessus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse11030000001103falsetruefalsefalsefalse2truefalsefalse624000000624falsetruefalsefalsefalse3truefalsefalse448000000448falsetruefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of exploratory well costs that have been capitalized for a period of greater than less than one year after the completion of drilling.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS19-1
-Paragraph 10
-Subparagraph b
falsefalse3false0us-gaap_CapitalizedExploratoryWellCostsus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse28930000002893falsefalsefalsefalsefalse2truefalsefalse20050000002005falsefalsefalsefalsefalse3truefalsefalse15850000001585falsefalsefalsefalsefalse4truefalsefalse12910000001291falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of capitalized exploratory well costs that is pending the determination of proved reserves. This should not include amounts that were capitalized and subsequently expensed in the same annual period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS19-1
-Paragraph 10
-Subparagraph a
truefalse4false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.exxonmobil.com/taxonomy/role/disclosureaccountingforsuspendedexploratorywellcostsscheduleofperiodendcapitalizedsuspendedexploratorywellcostsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period of Between One and Five Years [Member]
12/31/2010
USD ($)
$As_Of_12_31_201030http://www.sec.gov/CIK0000034088instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period of Between One and Five Years [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodOfBetweenOneAndFiveYearsMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period of Between One and Five Years [Member]
12/31/2009
USD ($)
$As_Of_12_31_200910http://www.sec.gov/CIK0000034088instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period of Between One and Five Years [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodOfBetweenOneAndFiveYearsMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$7falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period of Between One and Five Years [Member]
12/31/2008
USD ($)
$As_Of_12_31_20084http://www.sec.gov/CIK0000034088instant2008-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period of Between One and Five Years [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodOfBetweenOneAndFiveYearsMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse5false0us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYearus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse12940000001294falsefalsefalsefalsefalse2truefalsefalse924000000924falsefalsefalsefalsefalse3truefalsefalse636000000636falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS19-1
-Paragraph 10
-Subparagraph b
falsefalse6false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.exxonmobil.com/taxonomy/role/disclosureaccountingforsuspendedexploratorywellcostsscheduleofperiodendcapitalizedsuspendedexploratorywellcostsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse8falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period of Between Five and Ten Years [Member]
12/31/2010
USD ($)
$As_Of_12_31_201042http://www.sec.gov/CIK0000034088instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period of Between Five and Ten Years [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodOfBetweenFiveAndTenYearsMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$9falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period of Between Five and Ten Years [Member]
12/31/2009
USD ($)
$As_Of_12_31_20099http://www.sec.gov/CIK0000034088instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period of Between Five and Ten Years [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodOfBetweenFiveAndTenYearsMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period of Between Five and Ten Years [Member]
12/31/2008
USD ($)
$As_Of_12_31_20083http://www.sec.gov/CIK0000034088instant2008-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period of Between Five and Ten Years [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodOfBetweenFiveAndTenYearsMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse7false0us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYearus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse278000000278falsefalsefalsefalsefalse2truefalsefalse220000000220falsefalsefalsefalsefalse3truefalsefalse225000000225falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS19-1
-Paragraph 10
-Subparagraph b
falsefalse8false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.exxonmobil.com/taxonomy/role/disclosureaccountingforsuspendedexploratorywellcostsscheduleofperiodendcapitalizedsuspendedexploratorywellcostsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse11falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period of Greater than Ten Years [Member]
12/31/2010
USD ($)
$As_Of_12_31_201052http://www.sec.gov/CIK0000034088instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period of Greater than Ten Years [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodOfGreaterThanTenYearsMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$12falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period of Greater than Ten Years [Member]
12/31/2009
USD ($)
$As_Of_12_31_200911http://www.sec.gov/CIK0000034088instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period of Greater than Ten Years [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodOfGreaterThanTenYearsMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$13falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period of Greater than Ten Years [Member]
12/31/2008
USD ($)
$As_Of_12_31_20085http://www.sec.gov/CIK0000034088instant2008-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period of Greater than Ten Years [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodOfGreaterThanTenYearsMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse9false0us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYearus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse218000000218falsefalsefalsefalsefalse2truefalsefalse237000000237falsefalsefalsefalsefalse3truefalsefalse276000000276falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS19-1
-Paragraph 10
-Subparagraph b
falsefalse10false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.exxonmobil.com/taxonomy/role/disclosureaccountingforsuspendedexploratorywellcostsscheduleofperiodendcapitalizedsuspendedexploratorywellcostsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse14falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period Greater than One Year [Member]
12/31/2010
USD ($)
$As_Of_12_31_201029http://www.sec.gov/CIK0000034088instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period Greater than One Year [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodGreaterThanOneYearMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$15falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period Greater than One Year [Member]
12/31/2009
USD ($)
$As_Of_12_31_20098http://www.sec.gov/CIK0000034088instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period Greater than One Year [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodGreaterThanOneYearMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$16falsefalseUSDtruefalse{us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxis} : Capitalized for a Period Greater than One Year [Member]
12/31/2008
USD ($)
$As_Of_12_31_20082http://www.sec.gov/CIK0000034088instant2008-12-31T00:00:000001-01-01T00:00:00falsefalseCapitalized for a Period Greater than One Year [Member]us-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisxbrldihttp://xbrl.org/2006/xbrldixom_CapitalizedForPeriodGreaterThanOneYearMemberus-gaap_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearByProjectAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse11false0us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYearus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse17900000001790falsetruefalsefalsefalse2truefalsefalse13810000001381falsetruefalsefalsefalse3truefalsefalse11370000001137falsetruefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS19-1
-Paragraph 10
-Subparagraph b
falsefalse410Accounting for Suspended Exploratory Well Costs (Schedule of Period End Capitalized Suspended Exploratory Well Costs) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue