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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