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Lease Commitments - ASC 842 (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Operating Leases    
2022 $ 1,054  
2023 674  
2024 487  
2025 376  
2026 245  
Thereafter 1,049  
Total 3,885  
Less: Amounts representing interest 382  
Total lease liabilities 3,503 $ 3,906
Finance Leases    
2022 64  
2023 62  
2024 61  
2025 58  
2026 55  
Thereafter 316  
Total 616  
Less: Amounts representing interest 119  
Total lease liabilities $ 497 $ 633