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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025
Tax Credit Carryforward [Line Items] |  |  |  |  |
Effective income tax rate (as a percent) | 24.90% | 24.00% | 0.70% | 23.70% |
Increase (decrease) in income tax reserves |  |  | $ (86) |  |
Accrual of interest on long term receivable |  |  | 22 |  |
Long-term income tax receivable | $ 174 |  | 174 |  | $ 152
Research and Development Tax Credits |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Income tax reserves | $ 56 |  | $ 56 |  | $ 142

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