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Pension Benefits - Schedule of Net Periodic Expense for Pension Plans (Details) - Pension Plans, Defined Benefit - Non-U.S. Plans - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	$ 2	$ 2	$ 5
Interest cost on projected benefit obligation	7	8	7
Expected return on assets	(7)	(7)	(5)
Amortization of unrecognized actuarial loss and prior service costs	2	2	1
Curtailment/settlement loss (gain)	56	0	(1)
Net periodic pension expense	$ 60	$ 5	$ 7

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