U.S. and Europe Retrospective Responsibility Plans (Details) $ / shares in Units, € in Millions, shares in Millions, $ in Millions		9 Months Ended
	Jun. 21, 2016 USD ($)	Jun. 30, 2016 EUR (€)	Jun. 30, 2016 USD ($) $ / shares shares		Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Restricted Cash and Cash Equivalents Items [Line Items]
Escrow account			$ 1,027			$ 1,072
Closing stock price | $ / shares			$ 74.17
VE territory covered loss, maximum amount of loss to allow adjustment of conversion rate during six-month period | €		€ 20
Right to recover for covered losses			$ 25	[1],[2]		$ 0
U.K.& I preferred stock
Restricted Cash and Cash Equivalents Items [Line Items]
Preferred stock, shares outstanding | shares			2
Europe preferred stock
Restricted Cash and Cash Equivalents Items [Line Items]
Preferred stock, shares outstanding | shares			3
Visa Europe
Restricted Cash and Cash Equivalents Items [Line Items]
Initial conversion rate of U.K.&I and Europe preferred stock into Class A equivalent preferred stock	13.952
Right to recover for covered losses	$ 0
Covered Litigation
Restricted Cash and Cash Equivalents Items [Line Items]
Payments on litigation matters			$ 45		$ 355

[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, 2016; (b) the 13.952 class A common stock conversion rate applicable to both the U.K.&I and Europe preferred stock as of June 30, 2016; and (c) $74.17, Visa's class A common stock closing stock price as of June 30, 2016. Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.