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Income Taxes - Components of Net Deferred Income Taxes (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Deferred income tax assets: |  |
Accrued expenses | $ 66 | $ 103
Deferred compensation | 59 | 54
Stock-based compensation | 12 | 11
Postretirement benefits | 47 | 35
Net operating loss and other carryforwards | 9 | 10
Research and development expenditures and indirect effects | 335 | 248
State tax credits | 1 | 0
Operating lease liabilities | 62 | 64
Other | 12 | 10
Total gross deferred income tax assets | 603 | 535
Less: Valuation allowance | (9) | (8)
Total net deferred income tax assets | 594 | 527
Deferred income tax liabilities: |  |
Unbilled receivables | (89) | (132)
Intangible assets | (100) | (93)
Property and equipment | (25) | (26)
Operating lease right-of-use assets | (46) | (45)
Other | (2) | (4)
Total deferred income tax liabilities | (262) | (300)
Net deferred income tax asset | $ 332 | $ 227

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