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Leases - Schedule of Annual Payments Based on Maturities of Lease (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Remainder of 2019 $ 76
2020 96
2021 86
2022 85
2023 86
Thereafter 370
Total undiscounted lease payments 799
Less: present value adjustment (196)
Total discounted lease payments $ 603