Collateral (Detail) - USD ($) $ in Millions		Jun. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Cash equivalents		$ 1,266	$ 1,023
Pledged securities at market value		159	154
Letters of credit		1,275	1,178
Guarantees		1,365	971
Total		4,065	$ 3,326
Visa Europe
Business Acquisition [Line Items]
Cash equivalents	[1]	233
Pledged securities at market value		0
Letters of credit		164
Guarantees		326
Total		$ 723

[1] Cash collateral held by Visa Europe is not included on the Company's unaudited consolidated balance sheet as its clients retain beneficial ownership and the cash is only accessible to the Company in the event of default by the client on its settlement obligations.