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Reclassifications From Accumulated OCI (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reclassifications from accumulated other comprehensive (loss) income    
Selling, general and administrative expenses $ 397us-gaap_SellingGeneralAndAdministrativeExpense $ 395us-gaap_SellingGeneralAndAdministrativeExpense
Tax (benefit) expense 43us-gaap_IncomeTaxExpenseBenefit 5us-gaap_IncomeTaxExpenseBenefit
Net of tax 64us-gaap_NetIncomeLoss 74us-gaap_NetIncomeLoss
Actuarial losses, net | Amount Reclassified    
Reclassifications from accumulated other comprehensive (loss) income    
Selling, general and administrative expenses 5us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
3us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Tax (benefit) expense (1)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
 
Interest rate swaps. | Amount Reclassified    
Reclassifications from accumulated other comprehensive (loss) income    
Net of tax $ 4us-gaap_NetIncomeLoss
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
$ 3us-gaap_NetIncomeLoss
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember