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No authoritative reference available. false 4 Gain from sale of Appalachian E&P operations 2 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 2467000000 2467000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement. 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No authoritative reference available. false 85 State Line evaluation, impairment charge 2 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 163000000 163000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). 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