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Benefit Plans (Net Postemployment Costs) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]      
Service cost $ 1mo_PostemploymentBenefitsServiceCost $ 1mo_PostemploymentBenefitsServiceCost $ 1mo_PostemploymentBenefitsServiceCost
Interest cost 1mo_PostemploymentBenefitsInterestCost 1mo_PostemploymentBenefitsInterestCost 1mo_PostemploymentBenefitsInterestCost
Amortization of net loss 18mo_PostemploymentBenefitsAmortizationofGainsLosses 18mo_PostemploymentBenefitsAmortizationofGainsLosses 17mo_PostemploymentBenefitsAmortizationofGainsLosses
Other 2mo_PostemploymentBenefitsOtherCost (17)mo_PostemploymentBenefitsOtherCost (7)mo_PostemploymentBenefitsOtherCost
Net postemployment costs $ 22us-gaap_PostemploymentBenefitsPeriodExpense $ 3us-gaap_PostemploymentBenefitsPeriodExpense $ 12us-gaap_PostemploymentBenefitsPeriodExpense