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Leases - Maturity Analysis of Undiscounted Cash Out Flows (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Finance leases    
2022 $ 43  
2023 30  
2024 18  
2025 9  
2026 8  
Thereafter 28  
Imputed Interest (36)  
Finance lease obligations 99 $ 91
Operating leases    
2022 1,047  
2023 845  
2024 685  
2025 424  
2026 313  
Thereafter 356  
Imputed Interest (234)  
Operating lease liabilities 3,435  
Amount of leases not yet commenced $ 202