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Commitments and Contingencies - Leases and Unconditional Purchase Obligations (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Operating Leases  
2019 $ 24
2020 20
2021 18
2022 16
2023 12
Thereafter 26
Operating Leases 116
Unconditional Purchase Obligations  
2019 129
2020 89
2021 78
2022 76
2023 75
Thereafter 444
Unconditional Purchase Obligations $ 891