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Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) conversion_rate shares | Sep. 30, 2016 shares | Jun. 21, 2016 debt_instrument | Jun. 21, 2016 | Mar. 19, 2015 conversion_rate | Sep. 30, 2017 USD ($) conversion_rate $ / shares shares | Sep. 30, 2016 USD ($) shares | Oct. 31, 2017 $ / shares | Apr. 20, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction in as-converted stock (in shares) | shares |  |  |  |  |  |  |  | 79,000,000 |  |  |
Reduction in as-converted stock (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 89.92 |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 5,000
Stock repurchase plan, remaining authorized funds |  | $ 3,900 |  |  |  |  |  | $ 3,900 |  |  |
Dividends, paid |  |  |  |  |  |  |  | $ 1,600 |  |  |
Dividends, paid per share | $ / shares |  |  |  |  |  |  |  | $ 0.165 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends, per share amount declared | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.195 |
Deposit into Litigation Escrow |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deposits into litigation escrow account |  |  |  |  |  |  |  | $ 0 | $ 0 |  |
Class A common stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock split, conversion ratio |  |  |  |  |  |  | 4 |  |  |  |
Stockholders' Equity Note, Stock Split, Dividend Ratio |  |  |  |  |  |  | 3 |  |  |  |
Shares repurchased in the open market (in shares) | shares | [1],[2] |  |  |  |  |  |  | 77,000,000 | 91,000,000 |  |
Class B common stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, conversion rate | conversion_rate | [3] | 1.6483 |  |  |  |  | 1.6483 | 1.6483 |  |  |
Class C common stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, conversion rate | conversion_rate |  | 4.0000 |  |  |  |  | 4.0 | 4.0000 |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, conversion rate |  | 13.0770 | [3] | 13.952 |  |  |  |  |  |  |
Recovery through conversion rate adjustment |  |  |  |  |  |  |  | $ 190 |  |  |
Preferred stock, shares outstanding | shares |  | 2,000,000 |  | 2,000,000 |  |  |  | 2,000,000 | 2,000,000 |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding | shares |  | 5,000,000 |  | 5,000,000 |  |  |  | 5,000,000 | 5,000,000 |  |
Accelerated 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 | shares |  |  |  |  |  |  |  | 139,000,000 |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recovery through conversion rate adjustment |  |  |  |  |  |  |  | $ (191) |  |  |
Preferred Stock | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recovery through conversion rate adjustment |  |  |  |  |  |  |  | $ (190) |  |  |
Visa Europe |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of convertible debt instruments issued |  |  |  |  | 3 | 3 |  |  |  |  |
Visa Europe | Class A equivalent preferred stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, conversion rate |  |  |  |  |  |  |  | 100 |  |  |
[1] | All shares repurchased in the open market have been retired and constitute authorized but unissued shares.
[2] | Shares repurchased in the open market reflect repurchases settled during fiscal 2017. These amounts include repurchases traded but not yet settled on or before September 30, 2016 for fiscal 2017 or September 30, 2015 for fiscal 2016 and exclude repurchases traded but not yet settled on or before September 30, 2017 for fiscal 2017 or September 30, 2016 for fiscal 2016.
[3] | The class B to class A common stock conversion rate is presented on a rounded basis. Conversion calculations for dividend payments are based on a conversion rate rounded to the tenth decimal.

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