2.2.0.25truefalse41611 - Disclosure - Pension and Other Postretirement Benefits (Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets) (Details)truefalseIn Millionsfalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010
USD ($)
USD ($) / shares
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{xom_DefinedBenefitPlanFundedStatusOfPlanAxis} : Funded Pension Plans [Member]
12/31/2010
USD ($)
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{xom_DefinedBenefitPlanFundedStatusOfPlanAxis} : Funded Pension Plans [Member]
12/31/2009
USD ($)
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{xom_DefinedBenefitPlanFundedStatusOfPlanAxis} : Funded Pension Plans [Member]
12/31/2010
USD ($)
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{xom_DefinedBenefitPlanFundedStatusOfPlanAxis} : Funded Pension Plans [Member]
12/31/2009
USD ($)
$As_Of_12_31_200993http://www.sec.gov/CIK0000034088instant2009-12-31T00:00:000001-01-01T00:00:00falsefalsePension Benefits - Non-U.S. [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignPensionPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberfalsefalseFunded Pension Plans [Member]xom_DefinedBenefitPlanFundedStatusOfPlanAxisxbrldihttp://xbrl.org/2006/xbrldixom_FundedPensionPlansMemberxom_DefinedBenefitPlanFundedStatusOfPlanAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Pension Benefits - U.S. [Member]
{xom_DefinedBenefitPlanFundedStatusOfPlanAxis} : Unfunded Pension Plans [Member]
12/31/2010
USD ($)
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{xom_DefinedBenefitPlanFundedStatusOfPlanAxis} : Unfunded Pension Plans [Member]
12/31/2009
USD ($)
$As_Of_12_31_200996http://www.sec.gov/CIK0000034088instant2009-12-31T00:00:000001-01-01T00:00:00falsefalsePension Benefits - U.S. [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberfalsefalseUnfunded Pension Plans [Member]xom_DefinedBenefitPlanFundedStatusOfPlanAxisxbrldihttp://xbrl.org/2006/xbrldixom_UnfundedPensionPlansMemberxom_DefinedBenefitPlanFundedStatusOfPlanAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Pension Benefits - Non-U.S. [Member]
{xom_DefinedBenefitPlanFundedStatusOfPlanAxis} : Unfunded Pension Plans [Member]
12/31/2010
USD ($)
$As_Of_12_31_2010834http://www.sec.gov/CIK0000034088instant2010-12-31T00:00:000001-01-01T00:00:00falsefalsePension Benefits - Non-U.S. [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignPensionPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberfalsefalseUnfunded Pension Plans [Member]xom_DefinedBenefitPlanFundedStatusOfPlanAxisxbrldihttp://xbrl.org/2006/xbrldixom_UnfundedPensionPlansMemberxom_DefinedBenefitPlanFundedStatusOfPlanAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$9falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Pension Benefits - Non-U.S. [Member]
{xom_DefinedBenefitPlanFundedStatusOfPlanAxis} : Unfunded Pension Plans [Member]
12/31/2009
USD ($)
$As_Of_12_31_200994http://www.sec.gov/CIK0000034088instant2009-12-31T00:00:000001-01-01T00:00:00falsefalsePension Benefits - Non-U.S. [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignPensionPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberfalsefalseUnfunded Pension Plans [Member]xom_DefinedBenefitPlanFundedStatusOfPlanAxisxbrldihttp://xbrl.org/2006/xbrldixom_UnfundedPensionPlansMemberxom_DefinedBenefitPlanFundedStatusOfPlanAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Pension Benefits - U.S. [Member]
1/1/2010 - 12/31/2010
USD ($)
$Duration_1_1_2010_To_12_31_20103322http://www.sec.gov/CIK0000034088duration2010-01-01T00:00:002010-12-31T00:00:00falsefalsePension Benefits - U.S. [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$11falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Pension Benefits - Non-U.S. [Member]
1/1/2010 - 12/31/2010
USD ($)
$Duration_1_1_2010_To_12_31_201029http://www.sec.gov/CIK0000034088duration2010-01-01T00:00:002010-12-31T00:00:00falsefalsePension Benefits - Non-U.S. [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignPensionPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$12falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Other Postretirement Benefits [Member]
1/1/2010 - 12/31/2010
USD ($)
$Duration_1_1_2010_To_12_31_2010292http://www.sec.gov/CIK0000034088duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseOther Postretirement Benefits [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2false0us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligationus-gaaptruecreditinstantNo definition available.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:monetaryItemTypemonetaryIf aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph C3
falsefalse3false0us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligationus-gaaptruecreditinstantNo definition available.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:monetaryItemTypemonetaryIf aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 6
-Subparagraph b
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 6
-Subparagraph b
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph s
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph d
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph s
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph d
falsefalse1The Corporation amortizes the net balance of actuarial losses/(gains) as a component of net periodic benefit cost over the average remaining service period of active plan participants. 2The Corporation amortizes prior service cost on a straight-line basis as permitted under authoritative guidance for defined benefit pension and other postretirement benefit plans. 125Pension and Other Postretirement Benefits (Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
