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Accounts Payable and Other Accrued Expenses (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Payables and Accruals [Abstract]    
Vendor payables $ 686 $ 693
Provision for claimed costs 247 245
Accrued interest 35 16
Accrued expenses 33 33
Total accounts payable and other accrued expenses $ 1,001 $ 987