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Leases - Maturities of Lease Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Mar. 31, 2021
Operating Leases    
Remainder of 2022 $ 225  
2023 366  
2024 267  
2025 198  
2026 113  
Thereafter 202  
Operating lease payments 1,371  
Less: imputed interest (117)  
Total operating lease liabilities 1,254 $ 1,456
Finance Leases    
Remainder of 2022 188  
2023 290  
2024 170  
2025 80  
2026 28  
Thereafter 3  
Finance lease payments 759  
Less: imputed interest (30)  
Total finance lease liabilities $ 729 $ 894