Stockholders' Equity - Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail) shares in Millions		Jun. 21, 2016	Jun. 30, 2016 shares		Sep. 30, 2015 shares
Schedule of Common Stock as Converted [Line Items]
As-converted Class A Common Stock	[1]		2,442
U.K.& I preferred stock
Schedule of Common Stock as Converted [Line Items]
Preferred stock, shares outstanding			2
preferred stock U.K.&I conversion rate			13.9520
As-converted Class A Common Stock	[1]		35
Europe preferred stock
Schedule of Common Stock as Converted [Line Items]
Preferred stock, shares outstanding			3
preferred stock Europe conversion rate			13.9520
As-converted Class A Common Stock	[1]		44
Class A common stock
Schedule of Common Stock as Converted [Line Items]
Common stock, shares outstanding			1,891	[2]	1,950
As-converted Class A Common Stock	[1],[2]		1,891
Class B common stock
Schedule of Common Stock as Converted [Line Items]
Common stock, shares outstanding			245		245
Conversion Rate Into Class A Common Stock	[3]		1.6483
As-converted Class A Common Stock	[1]		405
Class C common stock
Schedule of Common Stock as Converted [Line Items]
Common stock, shares outstanding			17		20
Conversion Rate Into Class A Common Stock			4
As-converted Class A Common Stock	[1]		67
Visa Europe
Schedule of Common Stock as Converted [Line Items]
Initial conversion rate of U.K.&I and Europe preferred stock into 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] Class A common stock shares outstanding reflect repurchases settled on or before June 30, 2016. The Company repurchased an additional 2 million shares at the end of June, which did not settle until July 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.