Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Jun. 21, 2016
Derivative [Line Items]
Reduction in earnings from excluded forward points and ineffectiveness		$ 30	$ 29	$ 27
Expected amount of accumulated other comprehensive income (loss) expected to be reclassified		58
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net		74
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		(218)	1	$ (1)
Foreign exchange derivative instruments
Derivative [Line Items]
The aggregate notional amount of the Company's foreign currency forward contracts outstanding		1,600	1,200
Increase in aggregate notional amounts		189
Prepaid Expenses and Other Current Assets [Member]
Derivative [Line Items]
Cash flow hedges in an asset position		17
Accrued Liabilities
Derivative [Line Items]
Cash flow hedges in a liability position		78
Collateral received with counterparties		8
Other Assets
Derivative [Line Items]
Posted collateral		54
Visa Europe
Derivative [Line Items]
Deferred cash consideration liability	[1]				$ 1,236
Net investment					18,800
Visa Europe | Foreign exchange derivative instruments
Derivative [Line Items]
The aggregate notional amount of the Company's foreign currency forward contracts outstanding		$ 1,100	$ 0
Designated as Hedging Instrument | Visa Europe
Derivative [Line Items]
Deferred cash consideration liability					$ 1,200

[1] This amount reflects the fair value of deferred cash consideration of €1.0 billion, plus 4.0% compound annual interest, payable on the third anniversary of the Closing, discounted at a rate of 1.2%.