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Commitments and Contingencies - Maturities of Lease Liabilities (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 (Excluding the three months ended March 31, 2019) $ 104
2020 111
2021 93
2022 79
2023 71
2024 and beyond 416
Total undiscounted lease payments 874
Less: Imputed interest (147)
Present value of lease liabilities $ 727