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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Effective income tax rate reconciliation, percent	31.00%	26.00%
Excess tax benefits	$ 909	$ 698
Revaluation of the Visa Europe put option		$ 255
Increase in unrecognized tax benefits	33
Effective income tax rate reconciliation Unrecognized Tax Benefits that would Favorably Impact Effective Tax Rate	28
New Accounting Pronouncement, Early Adoption, Effect
Business Acquisition [Line Items]
Excess tax benefits	$ (26)

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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Revaluation of Put Option, Amount

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