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Leases - Annual Payments Based on the Maturities of Leases (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Leases [Abstract]  
2021 $ 86
2022 82
2023 81
2024 71
2025 47
Thereafter 34
Total undiscounted lease payments 401
Less present value adjustment (54)
Operating lease liability $ 347