Change in Projected Benefit Obligation/Accumulated Postretirement Benefit Obligation (Detail) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Recognized in Consolidated Balance Sheets:
Noncurrent asset		$ (22)	$ (36)
U.S. Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation-beginning of fiscal year		1,005	983
Visa Europe acquisition		0	0
Service cost		13	47	$ 46
Interest cost		40	40	42
Actuarial loss (gain)		86	40
Benefit payments		(64)	(105)
Plan amendment		(8)	0
Foreign currency exchange rate changes		0	0
Benefit obligation-end of fiscal year		1,072	1,005	983
Accumulated benefit obligation		1,072	994
Change in Plan Assets:
Fair value of plan assets-beginning of fiscal year		1,022	1,117
Visa Europe acquisition		0	0
Actual return on plan assets		118	(6)
Company contribution		1	16
Benefit payments		(64)	(105)
Foreign currency exchange rate changes		0	0
Fair value of plan assets-end of fiscal year		1,077	1,022	1,117
Funded status at end of fiscal year		5	17
Recognized in Consolidated Balance Sheets:
Noncurrent asset		(22)	(36)
Current liability		(9)	(9)
Noncurrent liability		(8)	(10)
Funded status at end of fiscal year		5	17
U.S. Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation-beginning of fiscal year		18	20
Service cost		0	0	0
Interest cost		1	1	1
Actuarial loss (gain)		(2)	0
Benefit payments		(3)	(3)
Plan amendment		0	0
Benefit obligation-end of fiscal year		14	18	20
Change in Plan Assets:
Fair value of plan assets-beginning of fiscal year		0	0
Actual return on plan assets		0	0
Company contribution		3	3
Benefit payments		(3)	(3)
Fair value of plan assets-end of fiscal year		0	0	$ 0
Funded status at end of fiscal year		(14)	(18)
Recognized in Consolidated Balance Sheets:
Noncurrent asset		0	0
Current liability		(3)	(3)
Noncurrent liability		(11)	(15)
Funded status at end of fiscal year		(14)	(18)
Non-U.S. Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation-beginning of fiscal year		0
Visa Europe acquisition		381
Service cost	[1]	1
Interest cost	[1]	3
Actuarial loss (gain)		86
Benefit payments		(1)
Plan amendment		0
Foreign currency exchange rate changes		4
Benefit obligation-end of fiscal year		474	0
Accumulated benefit obligation		474
Change in Plan Assets:
Fair value of plan assets-beginning of fiscal year		0
Visa Europe acquisition		287
Actual return on plan assets		25
Company contribution		102	0
Benefit payments		(1)
Foreign currency exchange rate changes		2
Fair value of plan assets-end of fiscal year		415	$ 0
Funded status at end of fiscal year		(59)
Recognized in Consolidated Balance Sheets:
Noncurrent asset		0
Current liability		(6)
Noncurrent liability		(53)
Funded status at end of fiscal year		$ (59)

[1] Represents Visa Europe's U.K. pension plans' net pension benefit cost recognized from the Closing through September 30, 2016.