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Stockholders' Equity - Additional Information (Detail)
$ / shares in Units, $ in Billions
 1 Months Ended 12 Months Ended
May 08, 2024
shares
Jul. 31, 2024
shares
Sep. 30, 2024
USD ($)
preferredStockSeries
shares
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2022
USD ($)
Oct. 29, 2024
$ / shares
May 06, 2024
shares
Oct. 31, 2023
USD ($)
Oct. 31, 2022
USD ($)
Class of Stock [Line Items]                  
Stock repurchase program, authorized amount | $               $ 25.0 $ 12.0
Stock repurchase plan, remaining authorized funds | $     $ 13.1            
Dividends declared and paid | $     $ 4.2 $ 3.8 $ 3.2        
Number of series of preferred stock acquired | preferredStockSeries     3            
Subsequent Event                  
Class of Stock [Line Items]                  
Dividends declared, quarterly, per share amount (in dollars per share) | $ / shares           $ 0.59      
Series A convertible participating preferred stock                  
Class of Stock [Line Items]                  
Issuance of stock (in shares)   99,264              
Preferred stock, shares authorized (in shares)     4,000,000 4,000,000          
Preferred stock, conversion rate     100.0000 100.0000          
Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)     25,000,000 25,000,000          
Series B Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)     2,000,000 2,000,000          
Preferred stock, conversion rate     1.0030 2.9370          
Series C Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)     3,000,000 3,000,000          
Preferred stock, conversion rate     1.7860 3.6290          
Class A common stock                  
Class of Stock [Line Items]                  
Common stock, shares authorized (in shares)     2,000,000,000,000.0 2,000,000,000,000.0          
Class B-1 common stock                  
Class of Stock [Line Items]                  
Common stock, shares authorized (in shares)     499,000,000 622,000,000          
Stock tendered during period, shares, stock exchange offer (in shares)             241,000,000    
Class B-2 common stock                  
Class of Stock [Line Items]                  
Issuance of stock (in shares) 120,000,000                
Common stock, shares authorized (in shares)     123,000,000            
Common Class B-3                  
Class of Stock [Line Items]                  
Common stock, shares authorized (in shares)     61,000,000            
Common Class B-4                  
Class of Stock [Line Items]                  
Common stock, shares authorized (in shares)     31,000,000            
Common Class B-5                  
Class of Stock [Line Items]                  
Common stock, shares authorized (in shares)     15,000,000            
Class C common stock                  
Class of Stock [Line Items]                  
Issuance of stock (in shares) 48,000,000                
Common stock, shares authorized (in shares)     1,100,000,000 1,100,000,000          
Class A equivalent preferred stock | Visa Europe                  
Class of Stock [Line Items]                  
Preferred stock, conversion rate     100