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Operating Leases - (Maturities of Operating Leases) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Lessee, Operating Lease, Liability, Payment, Due    
2021 $ 159  
2022 129  
2023 103  
2024 78  
2025 58  
Thereafter 138  
Total lease payments 665  
Less: Imputed interest (60)  
Total operating lease liabilities $ 605 $ 595