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Leases - Maturities of Lease Liabilities (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Leases [Abstract]  
2021 $ 210
2022 180
2023 159
2024 136
2025 107
Thereafter 369
Total lease payments 1,161
Less: interest 149
Present value of lease liabilities $ 1,012