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Commitments and Contingencies (Purchase Commitments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Purchase Obligation, Fiscal Year Maturity [Abstract]  
Purchase Obligation, Due in Next Twelve Months $ 2,617
Purchase Obligation, Due in Second Year 1,195
Purchase Obligation, Due in Third Year 643
Purchase Obligation, Due in Fourth Year 345
Purchase Obligation, Due in Fifth Year 311
Purchase Obligation, Due after Fifth Year 3,487
Long-term Purchase Commitment, Amount $ 8,598