1.0.0.3falseStatement Of Income Alternative (USD $)In Millions, except Per Share datafalse1$falsefalseiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares0false2$falsefalseiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares0false3$falsefalseiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares053us-gaap_RevenuesAbstractus-gaaptruenadurationstringNo definition available.falsefalsefalsefalsefalsetruefalsefalsefalse1falsefalse00falsefalse2falsefalse00falsefalse3falsefalse00falsefalseNo definition available.false64xom_SalesAndOtherOperatingRevenueIncludingSalesBasedTaxesxomfalsecreditdurationmonetaryTotal revenue from sale of goods and services during the reporting period, reduced by sales returns and allowances, and sales...falsefalsefalsefalsefalsefalsefalsefalsefalse1truetrue301500000000301500[2]falsefalse2truetrue459579000000459579[2]falsefalse3truetrue390328000000390328[2]falsefalseTotal revenue from sale of goods and services during the reporting period, reduced by sales returns and allowances, and sales discounts. Also includes sales-based taxes (e.g. excise and sales taxes) which are then deducted as sales-based tax expense.No authoritative reference available.false74us-gaap_IncomeLossFromEquityMethodInvestmentsus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue71430000007143falsefalse2falsetrue1108100000011081falsefalse3falsetrue89010000008901falsefalseNo definition available.No authoritative reference available.false84us-gaap_OtherIncomeus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue19430000001943[1]falsefalse2falsetrue66990000006699[1]falsefalse3falsetrue53230000005323[1]falsefalseNo definition available.No authoritative reference available.false94xom_TotalRevenuesAndOtherIncomexomfalsecreditdurationmonetaryTotal revenues and income from equity affiliates and other income.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue310586000000310586falsefalse2falsetrue477359000000477359falsefalse3falsetrue404552000000404552falsefalseTotal revenues and income from equity affiliates and other income.No authoritative reference available.true103us-gaap_CostsAndExpensesAbstractus-gaaptruenadurationstringNo definition available.falsefalsefalsefalsefalsetruefalsefalsefalse1falsefalse00falsefalse2falsefalse00falsefalse3falsefalse00falsefalseNo definition available.false114xom_CrudeOilAndProductPurchasesxomfalsedebitdurationmonetaryPurchase cost of crude oil, products and other raw materials, feedstocks, semi finished products, finished products and other...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue152806000000152806falsefalse2falsetrue249454000000249454falsefalse3falsetrue199498000000199498falsefalsePurchase cost of crude oil, products and other raw materials, feedstocks, semi finished products, finished products and other merchandise that become part of salable products for oil and gas, refining and marketing and chemical operations.No authoritative reference available.false124xom_ProductionAndManufacturingExpensesxomfalsedebitdurationmonetaryCosts, excluding deprecation, incurred to operate and maintain - 1) oil and gas wells, production, transportation and support...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue3302700000033027falsefalse2falsetrue3790500000037905falsefalse3falsetrue3188500000031885falsefalseCosts, excluding deprecation, incurred to operate and maintain - 1) oil and gas wells, production, transportation and support equipment and facilities; 2) refining manufacturing facilities; and 3) chemical manufacturing facilities.No authoritative reference available.false134us-gaap_SellingGeneralAndAdministrativeExpenseus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue1473500000014735falsefalse2falsetrue1587300000015873falsefalse3falsetrue1489000000014890falsefalseNo definition available.No authoritative reference available.false144us-gaap_DepreciationDepletionAndAmortizationus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue1191700000011917falsefalse2falsetrue1237900000012379falsefalse3falsetrue1225000000012250falsefalseNo definition available.No authoritative reference available.false154us-gaap_ExplorationExpenseus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue20210000002021falsefalse2falsetrue14510000001451falsefalse3falsetrue14690000001469falsefalseNo definition available.No authoritative reference available.false164us-gaap_InterestExpenseus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue548000000548falsefalse2falsetrue673000000673falsefalse3falsetrue400000000400falsefalseNo definition available.No authoritative reference available.false174us-gaap_ExciseAndSalesTaxesus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue2593600000025936[2]falsefalse2falsetrue3450800000034508[2]falsefalse3falsetrue3172800000031728[2]falsefalseNo definition available.No authoritative reference available.false184us-gaap_TaxesOtherus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue3481900000034819falsefalse2falsetrue4171900000041719falsefalse3falsetrue4095300000040953falsefalseNo definition available.No authoritative reference available.false194us-gaap_CostsAndExpensesus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue275809000000275809falsefalse2falsetrue393962000000393962falsefalse3falsetrue333073000000333073falsefalseNo definition available.No authoritative reference available.true203xom_IncomeIncludingEquityAffilateEarningsBeforeIncomeTaxesxomfalsecreditdurationmonetaryIncome, including income from equity affiliates, before income taxes.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue3477700000034777falsefalse2falsetrue8339700000083397falsefalse3falsetrue7147900000071479falsefalseIncome, including income from equity affiliates, before income taxes.No authoritative reference available.true213us-gaap_IncomeTaxExpenseBenefitus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue1511900000015119falsefalse2falsetrue3653000000036530falsefalse3falsetrue2986400000029864falsefalseNo definition available.No authoritative reference available.false223us-gaap_ProfitLossus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue1965800000019658falsefalse2falsetrue4686700000046867falsefalse3falsetrue4161500000041615falsefalseNo definition available.No authoritative reference available.true233us-gaap_NetIncomeLossAttributableToNoncontrollingInterestus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue378000000378falsefalse2falsetrue16470000001647falsefalse3falsetrue10050000001005falsefalseNo definition available.No authoritative reference available.false243us-gaap_NetIncomeLossus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1truetrue1928000000019280falsefalse2truetrue4522000000045220falsefalse3truetrue4061000000040610falsefalseNo definition available.No authoritative reference available.true253us-gaap_EarningsPerShareBasicus-gaaptruenadurationdecimalNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetrue1truetrue3.993.99falsefalse2truetrue8.708.70falsefalse3truetrue7.317.31falsefalseNo definition available.No authoritative reference available.false263us-gaap_EarningsPerShareDilutedus-gaaptruenadurationdecimalNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetrue1truetrue3.983.98falsefalse2truetrue8.668.66falsefalse3truetrue7.267.26falsefalseNo definition available.No authoritative reference available.false1Other income for 2008 includes a $62 million gain from the sale of a non-U.S. investment and a related $143 million foreign exchange loss.2Sales and other operating revenue includes sales-based taxes of $25,936 million for 2009, $34,508 million for 2008 and $31,728 million for 2007.false322falseMillionsUnKnownHundredsfalsetrue