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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 $ 496us-gaap_PurchaseObligationDueInNextTwelveMonths
2016 330us-gaap_PurchaseObligationDueInSecondYear
2017 278us-gaap_PurchaseObligationDueInThirdYear
2018 125us-gaap_PurchaseObligationDueInFourthYear
2019 106us-gaap_PurchaseObligationDueInFifthYear
2020 and thereafter 1,063us-gaap_PurchaseObligationDueAfterFifthYear
Total Purchase Obligations $ 2,398us-gaap_PurchaseObligation