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Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 19, 2015 conversion_rate | Sep. 30, 2016 USD ($) conversion_rate $ / shares shares | Oct. 31, 2016 $ / shares | Jul. 21, 2016 USD ($) | Jun. 21, 2016 USD ($) shares | Oct. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase plan, remaining authorized funds |  |  | $ 5,800 |  |  |  |  |  |  |
Dividends, paid |  |  | $ 1,400 |  |  |  |  |  |  |
Dividends, paid per share | $ / shares |  |  | $ 0.14 |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends, per share amount declared | $ / shares |  |  |  |  | $ 0.165 |  |  |  |  |
Deposit into Litigation Escrow |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deposits into litigation escrow account |  |  | $ 0 |  |  |  |  |  |  |
October 2015 Share Repurchase Program |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share repurchase plan, authorized amount |  |  |  |  |  |  |  |  | $ 5,000 |
July 2016 Share Repurchase Program |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share repurchase plan, authorized amount |  |  |  |  |  | $ 5,000 |  |  |  |
Class A common stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares, outstanding | shares |  |  | 1,871,000,000 | [1] |  |  |  |  |  | 1,950,000,000
Common Stock, Value, Outstanding |  |  | $ 0 |  |  |  |  |  |  | $ 0
Common stock split, conversion ratio |  | 4 |  |  |  |  |  |  |  |
Class B common stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares, outstanding | shares |  |  | 245,000,000 |  |  |  |  |  |  | 245,000,000
Common Stock, Value, Outstanding |  |  | $ 0 |  |  |  |  |  |  | $ 0
Common stock, conversion rate | conversion_rate | [2] | 1.6483 | 1.6483 |  |  |  |  |  |  |
Class C common stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares, outstanding | shares |  |  | 17,000,000 |  |  |  | 550,000 |  |  | 20,000,000
Common Stock, Value, Outstanding |  |  | $ 0 |  |  |  | $ (170) | [3] |  | $ 0
Common stock, conversion rate | conversion_rate |  | 4.0 | 4.0000 |  |  |  |  |  |  |
Class C common stock | Accelerated Share Repurchase Program Aggregate |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares of class C common stock released from transfer restrictions, converted to class A common stock | shares |  |  | 134,000,000 |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding | shares |  |  | 5,000,000 |  |  |  |  |  |  | 0
[1] | {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmVhOWM1MDkzNjQ1MjRmNzk4OTM0M2I5ZDEyODM0M2JlfFRleHRTZWxlY3Rpb246OENBNzc3NzIxMjY1M0Y0NTY4MDI2RUY3NTNDRjY1NjMM}
[2] | 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.
[3] | the fair value of the Visa class C common stock held by Visa Europe as of the Closing.

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