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Commitments and Contingencies (Details) - USD ($) $ in Millions	Sep. 30, 2025	Mar. 31, 2025
Concentration Risk [Line Items]
Liability for reductions and/or penalties from U.S Government audits	$ 247	$ 245
Claimed Indirect Costs | Increase To Revenue To Reflect Best Estimate Of Final Cost Rates
Concentration Risk [Line Items]
Liability for reductions and/or penalties from U.S Government audits	$ 247	$ 245

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