U.S. and Europe Retrospective Responsibility Plans - Preferred Stock Rollforward (Details) - USD ($)		3 Months Ended	9 Months Ended
		Jun. 30, 2017	Jun. 30, 2017
Preferred Stock and Right to Recover for Covered Losses [Roll Forward]
Recovery through conversion rate adjustment			$ 191,000,000
Right to recover for covered losses, beginning			34,000,000
VE territory covered losses incurred			(165,000,000)
Right to recover for covered losses, ending	[1],[2]	$ 8,000,000	8,000,000
U.K.& I preferred stock
Preferred Stock and Right to Recover for Covered Losses [Roll Forward]
Preferred stock, beginning			2,516,000,000
Recovery through conversion rate adjustment		(71,000,000)	(190,280,000.00)
Preferred stock, ending	[1]	2,326,000,000	2,326,000,000
Europe preferred stock
Preferred Stock and Right to Recover for Covered Losses [Roll Forward]
Preferred stock, beginning			3,201,000,000
Recovery through conversion rate adjustment			(1,000,000)
Preferred stock, ending	[1]	$ 3,200,000,000	$ 3,200,000,000

[1] Figures in the table may not recalculate exactly due to rounding. As-converted and book values are based on unrounded numbers.

[2] The as-converted value of preferred stock is calculated as the product of: (a) 2 million and 3 million shares of the U.K.&I and Europe preferred stock outstanding, respectively, as of June 30, 2017; (b)13.077 and 13.948, the class A common stock conversion rate applicable to the U.K.&I and Europe preferred stock as of June 30, 2017, respectively; and (c) $93.78, Visa's class A common stock closing stock price as of June 30, 2017.