Property, Equipment and Technology, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016		Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Technology, accumulated amortization	$ 1,700	$ 1,500
Depreciation and amortization	556	502	[1]	$ 494
Depreciation and amortization, amortization expense on technology	56	50		63
Property, Equipment and Technology
Finite-Lived Intangible Assets [Line Items]
Depreciation and amortization	500	452		431
Technology and Software
Finite-Lived Intangible Assets [Line Items]
Depreciation and amortization, amortization expense on technology	$ 285	$ 259		$ 251

[1] See Note 2—Visa Europe.