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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)

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