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Commitments and Contingencies (Future Minimum Capital Lease Payments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2015 $ 42us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2016 32us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
2017 20us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
2018 11us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
2019 4us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 8us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter
Total 117us-gaap_CapitalLeasesFutureMinimumPaymentsNetMinimumPayments1
Less amount representing interest (12)us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments [1]
Capital lease obligations $ 105us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Capital leases  
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
Weighted average interest rate 5.30%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
[1] The weighted average interest rate on our capital lease obligations as of December 31, 2014 was approximately 5.3 percent.