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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Tax Credit Carryforward [Line Items]          
Effective income tax rate (as a percent) 24.90% 24.00% 0.70% 23.70%  
Increase (decrease) in income tax reserves     $ (86)    
Accrual of interest on long term receivable     22    
Long-term income tax receivable $ 174   174   $ 152
Research and Development Tax Credits          
Tax Credit Carryforward [Line Items]          
Income tax reserves $ 56   $ 56   $ 142