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Leases - Maturities of Lease Liabilities (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Leases [Abstract]  
2020 $ 203
2021 172
2022 146
2023 132
2024 110
Thereafter 342
Total lease payments 1,105
Less: interest 161
Present value of lease liabilities $ 944