Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section 35
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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Business Combination, Contingent Consideration, Liability, Accrued Interest

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Commitments and Contingencies - Additional Information (Detail) $ in Millions, € in Billions	12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jun. 21, 2016 EUR (€)
Other Commitments [Line Items]
Rent expense incurred \| $	$ 134	$ 136	$ 134
Minimum
Other Commitments [Line Items]
Client Incentive Agreement Period	1 year
Maximum
Other Commitments [Line Items]
Client Incentive Agreement Period	16 years
Visa Europe
Other Commitments [Line Items]
Share capital of Visa Europe acquired (percent)				100.00%
Contingent consideration				€ 1.0
Accrued interest on contingent consideration				€ 0.0