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Leases - Schedule of Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Leases [Abstract]      
Operating cash flows from operating leases $ (270) $ (404) $ (339)
Operating cash flows from finance leases 0 0 (1)
Financing cash flows from finance leases (36) (39) (47)
Operating leases 699 599 391
Finance leases $ 34 $ 18 $ 21