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Leases - Maturities of Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Operating Leases    
2022 $ 191  
2023 141  
2024 96  
2025 69  
2026 45  
Thereafter 186  
Total future undiscounted lease payments 728  
Less imputed interest (95)  
Total operating lease liabilities 633 $ 660
Finance Leases    
2022 87  
2023 69  
2024 47  
2025 25  
2026 11  
Thereafter 14  
Total future undiscounted lease payments 253  
Less imputed interest (14)  
Total finance lease liabilities $ 239 $ 256