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Income Taxes - Schedule of Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Amount |  |  |
Income tax expense computed at U.S. Federal statutory rate | $ 181 | $ 256 | $ 179
State and local income taxes, net of federal income tax effect | 31 | 55 | 85
Foreign income taxes, net of federal tax |  | 0 | (8)
Foreign Derived Intangible Income (FDII) | (29) | (13) | (14)
Other | (3) |  |
Research and development and other federal credits | (103) | (40) | (31)
Non-deductible expenses, including non-deductible penalties | 10 | 7 | 5
Excess tax benefits from stock-based compensation |  | (6) | (10)
Executive compensation - 162(m) |  | 7 | 6
Changes in uncertain tax positions (including indirect effects) | (80) | 27 | 38
Other adjustments | 4 | (9) | (2)
Total income tax expense | $ 11 | $ 284 | $ 248
Rate |  |  |
Income tax expense computed at U.S. Federal statutory rate | 21.00% |  |
State and local income taxes, net of federal income tax effect | 3.60% |  |
Foreign Derived Intangible Income (FDII) | (3.40%) |  |
Other | (0.30%) |  |
Research and development and other federal credits | (12.00%) |  |
Nontaxable and non-deductible items | 1.20% |  |
Changes in uncertain tax positions | (9.30%) |  |
Other adjustments | 0.50% |  |
Income tax expense at the effective income tax rate | 1.30% |  |

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