v3.26.1
Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Amount      
Statutory federal tax expense rate $ 248,000,000    
State and local income taxes, net of federal benefit 3,000,000    
Effect of cross-border tax laws 73,000,000    
Research and development tax credits (37,000,000)    
Changes in unrecognized tax benefits 77,000,000    
Other adjustments 6,000,000    
Total provision for (benefit from) income taxes $ 293,000,000 $ 484,000,000 $ 316,000,000
Percent      
Statutory federal tax expense rate 21.00% 21.00% 21.00%
State taxes, net of federal benefit 0.30% 0.90% 1.10%
Differences between statutory rate and foreign effective tax rate   3.80% 2.90%
Effect of cross-border tax laws 6.20%    
Research and development credits (3.10%) (2.30%) (2.40%)
Changes in unrecognized tax benefits 6.50%    
Other 0.50% 0.40% 0.60%
Effective tax rate 24.80% 30.20% 19.90%
SINGAPORE      
Amount      
Nontaxable interest income $ (76,000,000)    
Statutory income tax rate differential $ (18,000,000)    
Percent      
Differences between statutory rate and foreign effective tax rate (1.50%)    
Nontaxable interest income (6.60%)    
SWITZERLAND      
Amount      
Statutory income tax rate differential $ (19,000,000)    
Percent      
Differences between statutory rate and foreign effective tax rate (1.60%)    
Other foreign jurisdictions      
Amount      
Statutory income tax rate differential $ 36,000,000    
Percent      
Differences between statutory rate and foreign effective tax rate 3.10%