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Debt (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Scheduled maturities of debt    
2016 $ 1,022us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths  
2017 1,131us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo  
2018 1,858us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree  
2019 277us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFour  
2020 33us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFive  
Thereafter 5,675us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive  
Total debt, excluding unamortized discounts, premiums and fair value adjustments 9,996us-gaap_DebtInstrumentCarryingAmount  
Total unamortized discounts, premiums and fair value adjustments, net 24us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet  
Total debt $ 10,020us-gaap_LongTermDebt $ 10,092us-gaap_LongTermDebt