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Leases - Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Operating Lease Liabilities, Payments Due    
2021 $ 272  
2022 228  
2023 177  
2024 131  
2025 100  
Thereafter 407  
Total future minimum lease payments - undiscounted 1,315  
Less: imputed interest (172)  
Present value of lease liabilities $ 1,143 $ 960