v3.26.1
Stockholders' Equity - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
May 07, 2026
$ / shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2026
USD ($)
$ / shares
shares
Mar. 31, 2026
USD ($)
$ / shares
shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
$ / shares
shares
Mar. 31, 2023
shares
Nov. 30, 2021
USD ($)
Class of Stock [Line Items]                
Stock repurchase program, authorized amount               $ 4,000,000,000.00
Repurchased shares under authorization (in shares) | shares     0 0 1,000,000.0 11,900,000    
Repurchased shares under authorization, value         $ 89,600,000 $ 988,900,000    
Stock repurchase program, remaining authorized repurchase amount     $ 1,560,000,000 $ 1,560,000,000        
Common stock held in treasury (in shares) | shares   39,292,311 36,344,956 36,344,956 39,292,311      
Preferred stock, liquidation preference (in dollars per share) | $ / shares   $ 1,000 $ 1,000 $ 1,000 $ 1,000      
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001 $ 0.001 $ 0.001      
Issuance of Series A Preferred Stock   $ 1,450,000,000   $ 0 $ 1,449,500,000 0    
Cumulative annual dividend rate (as a percentage)   7.50%            
Payment of cash dividends on Series A Preferred Stock       108,500,000 0 0    
Capped options indexed to equity, costs       $ 68,000,000.0 $ 160,100,000 $ 0    
Cash dividend paid (in dollars per share) | $ / shares       $ 1.820 $ 1.816 $ 1.682    
Cash dividend       $ 984,000,000.0 $ 975,700,000 $ 911,500,000    
Subsequent event                
Class of Stock [Line Items]                
Preferred dividends declared (in dollars per share) | $ / shares $ 18.750              
Common Stock Held in Treasury                
Class of Stock [Line Items]                
Repurchased shares under authorization (in shares) | shares         1,000,000.0 11,900,000    
Repurchased shares under authorization, value         $ 89,600,000 $ 988,900,000    
Common stock held in treasury (in shares) | shares   39,300,000 36,300,000 36,300,000 39,300,000 41,100,000 32,300,000  
Treasury stock used for new issuances and Issuance of Series A preferred stock (shares) | shares       3,000,000.0 2,800,000 3,100,000    
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]                
Treasury stock used for new issuances and Issuance of Series A preferred stock (shares) | shares   29,700,000            
Convertible preferred stock                
Class of Stock [Line Items]                
Treasury stock used for new issuances and Issuance of Series A preferred stock (shares) | 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) | $ / shares   $ 71.40