Fair Value of Intangible Assets and Related Accumulated Amortization Expense (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Jun. 21, 2016	Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Gross	$ 656		$ 691
Accumulated Amortization	(379)		(339)
Finite-Lived Intangible Assets, Net	277		352
Indefinite-lived Intangible Assets	26,957		11,009
Gross	27,613		11,700
Net	27,234		11,361
Customer relationships and reacquired rights
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets	22,873		6,925
Visa trade name
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets	4,084		2,564
Visa Europe franchise right
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets	0	$ 1,500	1,520
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	351		351
Accumulated Amortization	(220)		(196)
Finite-Lived Intangible Assets, Net	131		155
Tradenames
Finite-Lived Intangible Assets [Line Items]
Gross	192		192
Accumulated Amortization	(80)		(67)
Finite-Lived Intangible Assets, Net	112		125
Reseller relationships
Finite-Lived Intangible Assets [Line Items]
Gross	95		95
Accumulated Amortization	(70)		(59)
Finite-Lived Intangible Assets, Net	25		36
Other
Finite-Lived Intangible Assets [Line Items]
Gross	18		53
Accumulated Amortization	(9)		(17)
Finite-Lived Intangible Assets, Net	$ 9		$ 36