1.0.0.3 false CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions false 1 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 2 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 3 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 4 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 4 Net Income 2 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 39000000 39 false false 2 true true 72000000 72 false false 3 true true 95000000 95 false false 4 true true 217000000 217 false false No definition available. No authoritative reference available. false 6 Pension and postretirement benefits other than pensions: 3 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract 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 4 false false 0 0 false false No definition available. false 7 Amortization of net loss and prior service adjustment included in expense, net of tax 4 us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1000000 1 false false 2 false false 0 0 false false 3 false true 1000000 1 false false 4 false false 0 0 false false No definition available. No authoritative reference available. false 8 Unrealized gains (losses) on derivatives qualified as cash flow hedges: 3 us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecreaseAbstract 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 4 false false 0 0 false false No definition available. false 9 Unrealized holding gains (losses) arising during period, net of income tax expense (benefit) of $(50) and $(212) for the three months and $48 and $(304) for the six months ended June 30, 2009 and 2008, respectively 4 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -90000000 -90 false false 2 false true -316000000 -316 false false 3 false true 61000000 61 false false 4 false true -454000000 -454 false false No definition available. No authoritative reference available. false 10 Reclassification adjustments included in net income, net of income tax expense (benefit) of $(9) and $(95) for the three months and $23 and $(89) for the six months ended June 30, 2009 and 2008, respecitively 4 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 17000000 17 false false 2 false true 143000000 143 false false 3 false true -32000000 -32 false false 4 false true 135000000 135 false false No definition available. No authoritative reference available. false 11 Other comprehensive income (loss) 3 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true -72000000 -72 false false 2 false true -173000000 -173 false false 3 false true 30000000 30 false false 4 false true -319000000 -319 false false No definition available. No authoritative reference available. true 12 Comprehensive Income (Loss) 2 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -33000000 -33 false false 2 false true -101000000 -101 false false 3 false true 125000000 125 false false 4 false true -102000000 -102 false false No definition available. No authoritative reference available. true 13 Comprehensive Loss Attributable to Noncontrolling Interest 2 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1000000 1 false false 2 false false 0 0 false false 3 false true 1000000 1 false false 4 false false 0 0 false false No definition available. No authoritative reference available. false 14 Comprehensive Income (Loss) Attributable to Common Shareholders of EME 2 us-gaap_ComprehensiveIncomeNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true -32000000 -32 false false 2 true true -101000000 -101 false false 3 true true 126000000 126 false false 4 true true -102000000 -102 false false No definition available. No authoritative reference available. true false 4 10 false Millions UnKnown UnKnown false true