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Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or lossReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a falsefalseSales revenues43false0us-gaap_SegmentReportingInformationIntersegmentRevenueus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse-4572000000-4572000000falsefalsefalsefalsefalse2truefalsefalse-3842000000-3842000000falsefalsefalsefalsefalse3truefalsefalse-7532000000-7532000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of revenue from transactions with other operating segments of the same entity. 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12/31/2008 USD ($) $FROM_Jan01_2008_TO_Dec31_2008_us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis_GainsLossesOnCommodityAndOtherDerivativesNetMemberhttp://www.sec.gov/CIK0000773910duration2008-01-01T00:00:002008-12-31T00:00:00falsefalseGains Losses On Commodity and Other Derivatives Net [Member]us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxisxbrldihttp://xbrl.org/2006/xbrldiapc_GainsLossesOnCommodityAndOtherDerivativesNetMemberus-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseGains Losses On Commodity and Other Derivatives Net [Member]64false0apc_RealizedGainLossOnDerivativeInstrumentsapcfalsecreditdurationThe realized gain (loss) on risk management derivatives included in earnings for the period as a result of settlement of...falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-498000000-498000000falsetruefalsefalsefalse2truefalsefalse-852000000-852000000falsetruefalsefalsefalse3truefalsefalse339000000339000000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe realized gain (loss) on risk management derivatives included in earnings for the period as a result of settlement of derivative instruments.No authoritative reference available.falsefalseRealized (gains) losses on derivatives, net1Operating costs and expenses exclude exploration, depreciation, depletion and amortization and impairments since these expenses are excluded from Adjusted EBITDAX.2In the fourth quarter of 2010, the Company revised the definition of Adjusted EBITDAX to exclude the impact of unrealized (gains) losses on derivative instruments, net. 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