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Financing Arrangement - Schedule Of Interest Expense Related To Notes (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Debt Disclosure [Abstract]      
Amortization of debt discount $ 0 $ 0 $ (1)
Amortization of debt issuance costs (2) (2) (2)
Coupon interest expense (55) (55) (55)
Other interest expense (1) (1) 0
Total interest expense $ (58) $ (58) $ (58)