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Commitments and Contingencies (Purchase Commitments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2015 $ 2,384us-gaap_PurchaseObligationDueInNextTwelveMonths
2016 1,258us-gaap_PurchaseObligationDueInSecondYear
2017 742us-gaap_PurchaseObligationDueInThirdYear
2018 477us-gaap_PurchaseObligationDueInFourthYear
2019 431us-gaap_PurchaseObligationDueInFifthYear
2020 and thereafter 3,723us-gaap_PurchaseObligationDueAfterFifthYear
Total Purchase Commitments $ 9,015us-gaap_PurchaseObligation