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Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 conversion_rate shares | Sep. 30, 2016 conversion_rate shares | Sep. 30, 2015 shares | Jun. 21, 2016 shares | Mar. 19, 2015 conversion_rate
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  | 1,000,000 |  |  |  |  |  |
Conversion of class C common stock upon sale into public market (in shares) | [1] | 2,422,000,000 |  |  |  |  |  |
Initial conversion rate of UK&I and Europe preferred stock into class A common or class A equivalent preferred stock |  |  |  |  |  |  | 13.952 |
Series B Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 2,000,000 |  | 2,000,000 |  | 0 |  |
preferred stock series B conversion rate | conversion_rate |  | 13.9520 |  | 13.9520 |  |  |  |
Shares Outstanding As Converted Basis | [1] | 35,000,000 |  | 35,000,000 |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 3,000,000 |  | 3,000,000 |  | 0 |  |
Shares Outstanding As Converted Basis | [1] | 44,000,000 |  | 44,000,000 |  |  |  |
preferred stock series C conversion rate | conversion_rate |  | 13.9520 |  | 13.9520 |  |  |  |
Class A common stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | [3] |  |  | 91,000,000 | [2] | 44,000,000 |  |
Common stock, shares, outstanding |  | 1,871,000,000 | [4] | 1,871,000,000 | [4] | 1,950,000,000 |  |
Conversion of class C common stock upon sale into public market (in shares) | [1],[4] | 1,871,000,000 |  |  |  |  |  |
Class B common stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares, outstanding |  | 245,000,000 |  | 245,000,000 |  | 245,000,000 |  |
Common stock, conversion rate | conversion_rate | [5] | 1.6483 |  | 1.6483 |  |  |  | 1.6483
Conversion of class C common stock upon sale into public market (in shares) | [1] | 405,000,000 |  |  |  |  |  |
Class C common stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares, outstanding |  | 17,000,000 |  | 17,000,000 |  | 20,000,000 | 550,000 |
Common stock, conversion rate | conversion_rate |  | 4.0000 |  | 4.0000 |  |  |  | 4.0
Conversion of class C common stock upon sale into public market (in shares) | [1] | 67,000,000 |  |  |  |  |  |
Visa Europe |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Initial conversion rate of UK&I and Europe preferred stock into class A common or class A equivalent preferred stock |  |  |  |  |  |  | 13.952 |
[1] | Figures in the table may not recalculate exactly due to rounding. As-converted class A common stock is calculated based on unrounded numbers.
[2] | (in millions, except per share data)2016 (1) 2015Shares repurchased in the open market(2)91 44Average repurchase price per share(3)$77.05 $65.98Total cost$6,987 $2,910
[3] | All shares repurchased in the open market have been retired and constitute authorized but unissued shares.
[4] | {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmVhOWM1MDkzNjQ1MjRmNzk4OTM0M2I5ZDEyODM0M2JlfFRleHRTZWxlY3Rpb246OENBNzc3NzIxMjY1M0Y0NTY4MDI2RUY3NTNDRjY1NjMM}
[5] | 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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