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Financing Arrangement - Schedule Of Interest Expense Related To Notes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt Disclosure [Abstract]
Amortization of debt issuance costs	$ (1)	$ 0	$ (1)	$ (1)
Coupon interest expense	(14)	(14)	(28)	(28)
Total interest expense	$ (15)	$ (14)	$ (29)	$ (29)

X

- Definition

Amount of amortization expense attributable to debt issuance costs.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Amount of interest expense classified as nonoperating.

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