1.0.0.3 false Statement Of Income Alternative (USD $) In Millions, except Per Share data false 1 $ false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 shares Standard http://www.xbrl.org/2003/instance shares 0 false 2 $ false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 shares Standard http://www.xbrl.org/2003/instance shares 0 false 3 $ false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 shares Standard http://www.xbrl.org/2003/instance shares 0 5 3 us-gaap_RevenuesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 6 4 xom_SalesAndOtherOperatingRevenueIncludingSalesBasedTaxes xom false credit duration monetary Total revenue from sale of goods and services during the reporting period, reduced by sales returns and allowances, and sales... false false false false false false false false false 1 true true 301500000000 301500 [2] false false 2 true true 459579000000 459579 [2] false false 3 true true 390328000000 390328 [2] false false Total 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. false 7 4 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 7143000000 7143 false false 2 false true 11081000000 11081 false false 3 false true 8901000000 8901 false false No definition available. No authoritative reference available. false 8 4 us-gaap_OtherIncome us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1943000000 1943 [1] false false 2 false true 6699000000 6699 [1] false false 3 false true 5323000000 5323 [1] false false No definition available. No authoritative reference available. false 9 4 xom_TotalRevenuesAndOtherIncome xom false credit duration monetary Total revenues and income from equity affiliates and other income. false false false false false false false false false 1 false true 310586000000 310586 false false 2 false true 477359000000 477359 false false 3 false true 404552000000 404552 false false Total revenues and income from equity affiliates and other income. No authoritative reference available. true 10 3 us-gaap_CostsAndExpensesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 11 4 xom_CrudeOilAndProductPurchases xom false debit duration monetary Purchase cost of crude oil, products and other raw materials, feedstocks, semi finished products, finished products and other... false false false false false false false false false 1 false true 152806000000 152806 false false 2 false true 249454000000 249454 false false 3 false true 199498000000 199498 false false Purchase 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. false 12 4 xom_ProductionAndManufacturingExpenses xom false debit duration monetary Costs, excluding deprecation, incurred to operate and maintain - 1) oil and gas wells, production, transportation and support... false false false false false false false false false 1 false true 33027000000 33027 false false 2 false true 37905000000 37905 false false 3 false true 31885000000 31885 false false Costs, 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. false 13 4 us-gaap_SellingGeneralAndAdministrativeExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 14735000000 14735 false false 2 false true 15873000000 15873 false false 3 false true 14890000000 14890 false false No definition available. No authoritative reference available. false 14 4 us-gaap_DepreciationDepletionAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 11917000000 11917 false false 2 false true 12379000000 12379 false false 3 false true 12250000000 12250 false false No definition available. No authoritative reference available. false 15 4 us-gaap_ExplorationExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 2021000000 2021 false false 2 false true 1451000000 1451 false false 3 false true 1469000000 1469 false false No definition available. No authoritative reference available. false 16 4 us-gaap_InterestExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 548000000 548 false false 2 false true 673000000 673 false false 3 false true 400000000 400 false false No definition available. No authoritative reference available. false 17 4 us-gaap_ExciseAndSalesTaxes us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 25936000000 25936 [2] false false 2 false true 34508000000 34508 [2] false false 3 false true 31728000000 31728 [2] false false No definition available. No authoritative reference available. false 18 4 us-gaap_TaxesOther us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 34819000000 34819 false false 2 false true 41719000000 41719 false false 3 false true 40953000000 40953 false false No definition available. No authoritative reference available. false 19 4 us-gaap_CostsAndExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 275809000000 275809 false false 2 false true 393962000000 393962 false false 3 false true 333073000000 333073 false false No definition available. No authoritative reference available. true 20 3 xom_IncomeIncludingEquityAffilateEarningsBeforeIncomeTaxes xom false credit duration monetary Income, including income from equity affiliates, before income taxes. false false false false false false false false false 1 false true 34777000000 34777 false false 2 false true 83397000000 83397 false false 3 false true 71479000000 71479 false false Income, including income from equity affiliates, before income taxes. No authoritative reference available. true 21 3 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 15119000000 15119 false false 2 false true 36530000000 36530 false false 3 false true 29864000000 29864 false false No definition available. No authoritative reference available. false 22 3 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 19658000000 19658 false false 2 false true 46867000000 46867 false false 3 false true 41615000000 41615 false false No definition available. No authoritative reference available. true 23 3 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 378000000 378 false false 2 false true 1647000000 1647 false false 3 false true 1005000000 1005 false false No definition available. No authoritative reference available. false 24 3 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 19280000000 19280 false false 2 true true 45220000000 45220 false false 3 true true 40610000000 40610 false false No definition available. No authoritative reference available. true 25 3 us-gaap_EarningsPerShareBasic us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 3.99 3.99 false false 2 true true 8.70 8.70 false false 3 true true 7.31 7.31 false false No definition available. No authoritative reference available. false 26 3 us-gaap_EarningsPerShareDiluted us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 3.98 3.98 false false 2 true true 8.66 8.66 false false 3 true true 7.26 7.26 false false No definition available. No authoritative reference available. false 1 Other 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. 2 Sales 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. false 3 22 false Millions UnKnown Hundreds false true