2.2.0.25truefalse41904 - Disclosure - Acquisition of XTO Energy Inc. (Revenues and Earnings for XTO Energy Inc.) (Details)truefalseIn Millionsfalse1falsefalseUSDfalsefalse1/1/2010 - 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/2009-01-31cubicFeetxbrlus0USDUSD$2falsefalseUSDfalsefalse1/1/2009 - 12/31/2009
USD ($)
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/instancepurexbrli0USDUSD$3falsefalseUSDfalsefalse1/1/2008 - 12/31/2008
USD ($)
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$4falsefalseUSDtruefalse{us-gaap_BusinessAcquisitionAxis} : Acquisition Date Through Dec. 31, 2010 Acquisition XTO Energy [Member]
7/1/2010 - 12/31/2010
USD ($)
$Duration_7_1_2010_To_12_31_2010http://www.sec.gov/CIK0000034088duration2010-07-01T00:00:002010-12-31T00:00:00falsefalseAcquisition Date Through Dec. 31, 2010 Acquisition XTO Energy [Member]us-gaap_BusinessAcquisitionAxisxbrldihttp://xbrl.org/2006/xbrldixom_AcquisitionDateThroughDec312010AcquistionXtoEnergyMemberus-gaap_BusinessAcquisitionAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false0xom_TotalRevenuesAndOtherIncomexomfalsecreditdurationTotal revenues and income from equity affiliates and other income.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse383221000000383221falsetruefalsefalsefalse2truefalsefalse310586000000310586falsetruefalsefalsefalse3truefalsefalse477359000000477359falsetruefalsefalsefalse4truefalsefalse44480000004448falsetruefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryTotal revenues and income from equity affiliates and other income.No authoritative reference available.falsefalse3false0us-gaap_SegmentReportingInformationProfitLossus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse262000000262falsetruefalsetruefalseMonetaryxbrli: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
falsefalse42Acquisition of XTO Energy Inc. (Revenues and Earnings for XTO Energy Inc.) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
