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Leases - Schedule of Minimum Lease Commitments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
2021 $ 157  
2022 133  
2023 89  
2024 58  
2025 46  
Thereafter 232  
Total lease commitments 715  
Less: Interest (102)  
Present value of lease liabilities $ 613 $ 636