1.0.0.3 false Consolidated Statements of Comprehensive Income (USD $) In Millions false 1 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 3 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 2 Consolidated Statements of Comprehensive Income [Abstract] 0 us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract 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 3 Consolidated Net Income 1 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 1708000000 1708 false false 2 true true 1807000000 1807 false false 3 true true 1782000000 1782 false false No definition available. No authoritative reference available. true 5 Qualifying hedges: 2 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 No definition available. false 6 Changes in fair value, net of tax of $(3), $(19), and $(3), respectively 3 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -4000000 -4 false false 2 false true -30000000 -30 false false 3 false true -5000000 -5 false false No definition available. No authoritative reference available. false 7 Reclassification adjustment for amounts included in net income, net of tax of $18, $7, and $6, respectively 3 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 28000000 28 false false 2 false true 11000000 11 false false 3 false true 9000000 9 false false No definition available. No authoritative reference available. false 8 Marketable securities: 2 us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract 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 9 Changes in fair value, net of tax of $1, $(4), and $3, respectively 3 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 4000000 4 false false 2 false true -7000000 -7 false false 3 false true 4000000 4 false false No definition available. No authoritative reference available. false 10 Reclassification adjustment for amounts included in net income, net of tax of $-, $-, and $-, respectively 3 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 0 0 false false 3 false true -1000000 -1 false false No definition available. No authoritative reference available. false 11 Pension and other postretirement benefit plans: 2 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 No definition available. false 12 Benefit plan net gain (loss),net of tax of $(8), $(32) and $13, respectively 3 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -12000000 -12 false false 2 false true -51000000 -51 false false 3 false true 20000000 20 false false No definition available. No authoritative reference available. false 13 Additional prior service costs from amendment to non-qualified plans, net of tax of $-, $-, and $(2), respectively 3 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 0 0 false false 3 false true -2000000 -2 false false No definition available. No authoritative reference available. false 14 Reclassification adjustment for amounts included in net income, net of tax of $1, $1, and $1, respectively 3 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 true 2000000 2 false false 3 false true 2000000 2 false false No definition available. No authoritative reference available. true 15 Total other comprehensive income (loss) 2 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 17000000 17 false false 2 false true -75000000 -75 false false 3 false true 27000000 27 false false No definition available. No authoritative reference available. true 16 Dividends on preferred and preference stock of subsidiaries 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -65000000 -65 false false 2 false true -65000000 -65 false false 3 false true -48000000 -48 false false No definition available. No authoritative reference available. true 17 Consolidated Comprehensive Income 2 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 1660000000 1660 false false 2 true true 1667000000 1667 false false 3 true true 1761000000 1761 false false No definition available. No authoritative reference available. true false 3 15 false Millions UnKnown UnKnown false true