v3.26.1
Income Taxes - Schedule of Reconciliation of Effective Income Tax Rate (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Amount      
Income tax expense computed at U.S. Federal statutory rate $ 181 $ 256 $ 179
State and local income taxes, net of federal income tax effect 31 55 85
Foreign income taxes, net of federal tax   0 (8)
Foreign Derived Intangible Income (FDII) (29) (13) (14)
Other (3)    
Research and development and other federal credits (103) (40) (31)
Non-deductible expenses, including non-deductible penalties 10 7 5
Excess tax benefits from stock-based compensation   (6) (10)
Executive compensation - 162(m)   7 6
Changes in uncertain tax positions (including indirect effects) (80) 27 38
Other adjustments 4 (9) (2)
Total income tax expense $ 11 $ 284 $ 248
Rate      
Income tax expense computed at U.S. Federal statutory rate 21.00%    
State and local income taxes, net of federal income tax effect 3.60%    
Foreign Derived Intangible Income (FDII) (3.40%)    
Other (0.30%)    
Research and development and other federal credits (12.00%)    
Nontaxable and non-deductible items 1.20%    
Changes in uncertain tax positions (9.30%)    
Other adjustments 0.50%    
Income tax expense at the effective income tax rate 1.30%