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Leases - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Operating Leases, Supplemental Cash Flow Information [Abstract]      
Cash paid for amounts included in the measurement of operating lease liabilities – operating cash flows $ 309 $ 353 $ 404
ROU assets obtained in exchange for operating lease liabilities 241 175 227
Lease modifications and terminations 703 880 1,142
Finance Leases, Supplemental Cash Flow Information [Abstract]      
Interest paid for finance lease liabilities – Operating cash flows 14 15 17
Cash paid for amounts included in the measurement of finance lease obligations – financing cash flows 200 240 315
Total cash paid in the measurement of finance lease obligations 214 255 332
Capital expenditures through finance lease obligations $ 24 $ 105 $ 102