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Stockholders' Equity - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Nov. 30, 2021
Class of Stock [Line Items]            
Stock repurchase program, authorized amount           $ 4,000,000,000.00
Repurchased shares under authorization (in shares)   1,000,000.0 11,900,000 12,900,000    
Repurchased shares under authorization, value   $ 89,600,000 $ 988,900,000 $ 945,900,000    
Excise tax (as a percent) 1.00% 1.00%        
Stock repurchase program, remaining authorized repurchase amount $ 1,560,000,000 $ 1,560,000,000        
Common stock held in treasury (in shares) 39,292,311 39,292,311 41,142,968      
Preferred stock, liquidation preference (in dollars per share) $ 1,000 $ 1,000        
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001      
Issuance of Series A Preferred Stock $ 1,450,000,000 $ 1,449,500,000 $ 0 0    
Cumulative annual dividend rate (as a percentage) 7.50%          
Capped options indexed to equity, costs   $ 160,100,000 $ 0 $ 0    
Cash dividend paid (in dollars per share)   $ 1.816 $ 1.682 $ 1.263    
Cash dividend   $ 975,700,000 $ 911,500,000 $ 695,300,000    
Common Stock Held in Treasury Amount            
Class of Stock [Line Items]            
Repurchased shares under authorization (in shares)   1,000,000.0 11,900,000 12,900,000    
Repurchased shares under authorization, value   $ 89,600,000 $ 988,900,000 $ 945,800,000    
Common stock held in treasury (in shares) 39,300,000 39,300,000 41,100,000 32,300,000 23,300,000  
Minimum            
Class of Stock [Line Items]            
Preferred stock, conversion ratio 16.0060 16.0060        
Maximum            
Class of Stock [Line Items]            
Preferred stock, conversion ratio 19.6080 19.6080        
Depository shares            
Class of Stock [Line Items]            
Issuance of Series A Preferred Stock (shares) 29,700,000          
Convertible preferred stock            
Class of Stock [Line Items]            
Issuance of Series A Preferred Stock (shares) 1,500,000          
Capped options indexed to equity, costs $ 55,100,000          
Convertible preferred stock | Maximum            
Class of Stock [Line Items]            
Option indexed to equity, strike price (in dollars per share) $ 71.40