Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Jun. 30, 2016		Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015
Business Acquisition [Line Items]
Effective income tax rate reconciliation, percent		2.00%			22.00%	26.00%		28.00%
Visa Europe Framework Agreement loss		$ 1,877	[1]		$ 0	$ 1,877	[1]	$ 0
Revaluation of the Visa Europe put option				$ 255
Decrease in tax benefit resulting from the resolution of uncertain tax positions					$ 239
Increase in unrecognized tax benefits		84				135
Effective income tax rate reconciliation Unrecognized Tax Benefits that would Favorably Impact Effective Tax Rate		28				81
Increase in accrued interest related to uncertain tax positions		25				32
Increase in accrued penalties		$ 9				10
Visa Europe
Business Acquisition [Line Items]
Tax benefit						693
Visa Europe Framework Agreement loss	[2]					$ 1,856

[1] The Company did not include Visa Europe's financial results in the Company's unaudited consolidated statements of operations from the acquisition date, June 21, 2016, through June 30, 2016 as the impact is immaterial. See Note 2—Visa Europe to these unaudited consolidated financial statements.

[2] the loss upon consummation of the transaction resulting from the effective settlement of the Framework Agreement between Visa and Visa Europe. The Visa Europe Framework Agreement provided Visa Europe with a perpetual, exclusive right to operate the Visa business in the European Union in exchange for a license fee paid to Visa. Under the terms of the Framework Agreement, the license fee paid by Visa Europe has increased modestly since inception in 2007, while the value of the Visa Europe business has increased at a greater rate. Using an income approach, the Company assessed the contractual terms and conditions of the Framework Agreement as compared to current market conditions and the historical and expected financial performance of Visa Europe. Based on the analysis performed, the Company determined that the terms were not at fair value as determined under U.S. GAAP at the Closing. The present value of the expected differential between payments required by the Framework Agreement and those that would be required if the contract were at fair value under U.S. GAAP was calculated over the Framework Agreement's contractual perpetual term, resulting in a loss of $1.9 billion recognized within operating expense in the Company's unaudited consolidated statement of operations during the third quarter of fiscal 2016, and a reduction to the purchase accounting consideration; and