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Commitments and Contingencies - Lease Commitments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Operating Leases  
2019 $ 44
2020 36
2021 25
2022 18
2023 16
Thereafter 34
Total minimum lease payments 173
Sublease Income  
2019 2
2020 1
2021 1
2022 0
2023 0
Thereafter $ 0