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v3.25.1

Commitments and Contingencies (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Concentration Risk [Line Items] |  |  |  |
Operating income (loss) |  | $ 1,370 | $ 1,014 | $ 447
Net income |  | $ 935 | $ 606 | $ 272
Basic (in dollars per share) |  | $ 7.28 | $ 4.61 | $ 2.04
Diluted (in dollars per share) |  | $ 7.25 | $ 4.59 | $ 2.03
Provision for claimed costs |  | $ 245 | $ 364 |
Amount awarded from other party | $ (115) |  |  |
Claimed Indirect Costs |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Decrease in reserve |  | 122 | 18 |
Claimed Indirect Costs | Increase To Revenue To Reflect Best Estimate Of Final Cost Rates |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Provision for claimed costs |  | 245 | 364 |
Claimed Indirect Costs | Revision of Prior Period, Adjustment |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Operating income (loss) |  | 122 | 18 |
Net income |  | $ 90 | $ 14 |
Basic (in dollars per share) |  | $ 0.70 | $ 0.10 |
Diluted (in dollars per share) |  | $ 0.70 | $ 0.10 |
U.S. Government Contracts |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Provision for claimed costs |  | $ 0 | $ 0 |
Financial Standby Letter of Credit |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Guarantor obligations, carrying value |  | 4 |  |
Guarantor obligations, reduction to available borrowings |  | 1 | 1 |
Guarantor obligations, facility |  | 3 | 8 |
Guarantor obligations, available amount |  | $ 0 | $ 4 |

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