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Income Taxes - Schedule of Reconciliation Between Effective Tax Rate and Statutory Tax Rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Amount      
U.S. federal statutory tax rate $ 1,302 $ 915 $ 796
State income taxes, net of federal tax benefit 213 145 104
Valuation allowance release   0 (157)
Foreign tax effects   (25) (16)
Effect of cross-border tax laws (30)    
Tax credits (2) (27)    
Nontaxable or nondeductible items (21)    
Changes in unrecognized tax benefits (2) 65 91 116
Liquidation of investment (158)    
Income tax expense $ 1,102 $ 878 $ 629
Percent      
U.S. federal statutory tax rate 21.00%    
State and local income taxes, net of federal income tax effect 3.40%    
Effect of cross-border tax laws (0.50%)    
Tax credits (2) (0.40%)    
Nontaxable or nondeductible items (0.30%)    
Changes in unrecognized tax benefits (2) 1.00%    
Liquidation of investment (0.025)    
Effective tax rate 17.80% 20.10% 16.60%
Luxembourg      
Amount      
Valuation allowance release $ (119)    
Other $ 2    
Percent      
Valuation allowance release (1.90%)    
Other 0.00%    
Germany      
Amount      
Foreign tax effects $ (99)    
Percent      
Foreign tax effects (1.60%)    
Others      
Amount      
Foreign tax effects $ (26)    
Percent      
Foreign tax effects (0.40%)