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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Operating Loss Carryforwards [Line Items] |  |  |
Income tax receivable | $ 88 |  |
Income tax payable | 10 |  |
Income tax receivable | 178 |  |
Income taxes | 103 | $ 379 | $ 336
Net operating losses | 206 | 9 |
Tax credit carryforwards | 45 | 1 |
Tax credit carryforwards, research and development | 40 |  |
Reserves for uncertain tax positions | 75 | 142 | 115
Unrecognized tax benefits that would impact effective tax rate | 71 | 125 | 104
Unrecognized tax benefits that decrease deferred tax assets | 20 | 3 |
Recognized accrued interest and penalties | (16) | 7 | 7
Income tax reserve, accrued penalties and interest | 4 | $ 20 | $ 13
Increase (decrease) in income tax reserves | (86) |  |
Accrual of interest on long term receivable | (24) |  |
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards, not subject to expiration | 192 |  |
Operating loss carryforwards, subject to expiration | $ 1 |  |

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