Financing Arrangement - Schedule Of Interest Expense Related To Notes (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Debt Disclosure [Abstract]
Amortization of debt issuance costs	$ (2)	$ (2)	$ (2)
Coupon interest expense	(51)	(55)	(55)
Other interest expense	0	(1)	(1)
Total interest expense	$ (53)	$ (58)	$ (58)

Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details