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Leases - Supplemental Cash Flow and Other 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 liabilities $ 71 $ 76 $ 67
Operating lease liabilities arising from obtaining ROU asset $ 54 $ 40 $ 17
Weighted average remaining lease term (in years) 4 years 3 months 18 days 4 years 6 months  
Weighted average discount rate 5.00% 5.00%