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Stockholders' Equity - Additional Information (Detail)
$ / shares in Units, $ in Billions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
$ / shares
Jun. 30, 2020
$ / shares
Mar. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
Sep. 30, 2019
$ / shares
Jun. 30, 2019
$ / shares
Mar. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Sep. 30, 2018
$ / shares
Jun. 30, 2018
$ / shares
Mar. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
Sep. 30, 2020
USD ($)
preferredStockSeries
$ / shares
shares
Oct. 23, 2020
$ / shares
Jan. 31, 2020
USD ($)
Jan. 31, 2019
USD ($)
Class of Stock [Line Items]                                      
Stock repurchase program, authorized amount                                   $ 9.5 $ 8.5
Stock repurchase plan, remaining authorized funds $ 5.5   $ 5.5 $ 5.5                       $ 5.5      
Dividends, paid                               $ 2.7      
Dividends paid, quarterly, per share (in dollars per share) | $ / shares       $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.210 $ 0.210 $ 0.210 $ 0.195 $ 0.30      
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                                 $ 0.32    
Series A convertible participating preferred stock                                      
Class of Stock [Line Items]                                      
Issuance of series A preferred stock (in shares) | shares     374,819                                
Preferred stock, conversion rate 100.0000 0                                  
Visa Europe | Class A equivalent preferred stock                                      
Class of Stock [Line Items]                                      
Preferred stock, conversion rate                               100      
Share Repurchase Program Aggregate | Class C common stock                                      
Class of Stock [Line Items]                                      
Shares of class C common stock released from transfer restrictions, converted to class A common stock (in shares) | shares                               140,000,000