v3.26.3
Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Mar. 31, 2026
Tax Credit Carryforward [Line Items]          
Effective income tax rate (as a percent) 9.00% 24.90% 15.80% 0.70%  
Decrease in income tax reserves       $ 86  
Accrual of interest on long term receivable     $ 3 $ 22  
Long-term income tax receivable $ 182   182   $ 178
Research and Development Tax Credits          
Tax Credit Carryforward [Line Items]          
Income tax reserves $ 85   $ 85   $ 75