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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
Leases [Abstract]      
Cash paid for amounts included in the measurement of lease liability $ 87 $ 74 $ 97
ROU assets obtained in exchange for new lease obligations $ 97 $ 37 $ 97