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Leases - Maturities of Operating Lease Liabilities (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Leases [Abstract]  
2019 $ 133
2020 181
2021 144
2022 102
2023 76
2024 57
Thereafter 148
Total lease payments 841
Less: imputed interest (102)
Total ROU Liabilities $ 739