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Commitments and Contingencies (Schedule of Purchase Obligations) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 $ 205
2021 171
2022 119
2023 81
2024 39
Thereafter 57
Total purchase obligations $ 672