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Commitments and Contingencies (Schedule of Purchase Obligations) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 $ 210
2020 151
2021 102
2022 89
2023 61
Thereafter 35
Total purchase obligations $ 648