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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Mar. 31, 2025
--- | --- | ---
Deferred tax assets: |  |
Accrued expenses | $ 68 | $ 66
Deferred compensation | 60 | 59
Stock-based compensation | 12 | 12
Postretirement benefits | 46 | 47
Net operating loss and other carryforwards | 206 | 9
Research and development expenditures and indirect effects | 98 | 335
State tax credits | 45 | 1
Operating lease liabilities | 52 | 62
Other | 6 | 12
Total gross deferred tax assets | 593 | 603
Less: valuation allowance | (10) | (9)
Total net deferred income tax assets | 583 | 594
Deferred tax liabilities: |  |
Unbilled receivables | (90) | (89)
Intangible assets | (112) | (100)
Property and equipment | (33) | (25)
Operating lease right-of-use assets | (38) | (46)
Other | (16) | (2)
Total deferred tax liabilities | (289) | (262)
Net deferred income tax asset | $ 294 | $ 332

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