1.0.0.3 false Consolidated Statements of Comprehensive Income (Parenthetical) (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 4 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 5 Changes in fair value of qualifying hedges, tax 3 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 true true -3000000 -3 false false 2 true true -19000000 -19 false false 3 true true -3000000 -3 false false No definition available. No authoritative reference available. false 6 Reclassification adjustment for amounts of qualifying hedges included in net income, tax 3 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 18000000 18 false false 2 false true 7000000 7 false false 3 false true 6000000 6 false false No definition available. No authoritative reference available. false 7 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 8 Change in fair value of marketable securities, tax 3 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 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 true -4000000 -4 false false 3 false true 3000000 3 false false No definition available. No authoritative reference available. false 9 Reclassification adjustment for amounts of marketable securities included in net income, tax 3 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax us-gaap true credit 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 0 0 false false No definition available. No authoritative reference available. false 10 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 11 Benefit plan net gain (loss), tax 3 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -8000000 -8 false false 2 false true -32000000 -32 false false 3 false true 13000000 13 false false No definition available. No authoritative reference available. false 12 Additional prior service costs from amendment to non-qualified plans, tax 3 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsArisingDuringPeriodTax 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 13 Reclassification adjustment for amounts of pension and other post retirement benefit plans included in net income, tax 3 us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 1000000 1 false false 2 true true 1000000 1 false false 3 true true 1000000 1 false false No definition available. No authoritative reference available. false false 3 10 false Millions UnKnown UnKnown false true