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Commitments and Contingencies (Schedule of Purchase Obligations) (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2016 $ 248
2017 177
2018 149
2019 114
2020 112
Thereafter 186
Total purchase obligations $ 986