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Information that Causes the Income Tax Expense to Differ from the Amount of Income Tax Determined by Applying the Applicable U.S. Federal Statutory Rate of 35% to Pretax Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016		Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
U.S. federal income tax at statutory rate	$ 2,804		$ 3,148	$ 2,704
State income taxes, net of federal benefit	135		194	129
Non-U.S. tax effect, net of federal benefit	(553)		(327)	(278)
Prior years U.S. domestic production activities deduction	0		0	(191)
Remeasurement of deferred tax liability	(88)		0	0
Reversal of prior years tax reserves related to the resolution of uncertain tax positions	0		(239)	0
Revaluation of Visa Europe put option	(89)		0	0
Other, net	(188)		(109)	(78)
Income tax provision	$ 2,021	[1]	$ 2,667	$ 2,286
U.S. federal income tax at statutory rate, percent	35.00%		35.00%	35.00%
State income taxes, net of federal benefit, percent	2.00%		2.00%	2.00%
Non-U.S. tax effect, net of federal benefit, percent	(7.00%)		(4.00%)	(4.00%)
Prior years U.S. domestic production activities deduction, percent	0.00%		0.00%	(2.00%)
Remeasurement of deferred tax liability, percent	(1.00%)		0.00%	0.00%
Reversal of prior years tax reserves related to the resolution of uncertain tax positions, percent	0.00%		(2.00%)	0.00%
Revaluation of Visa Europe put option, percent	(1.00%)		0.00%	0.00%
Other, net, percent	(3.00%)		(1.00%)	(1.00%)
Income tax expense, percent	25.00%		30.00%	30.00%
[1] The Company did not include Visa Europe's financial results in the Company's consolidated statements of operations from the acquisition date, June 21, 2016, through June 30, 2016 as the impact was immaterial. The Company's consolidated statement of operations for the year ended September 30, 2016 includes Visa Europe's financial results for the three months ended September 30, 2016. See Note 2—Acquisition of Visa Europe.

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