Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
U.S. Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		$ 13	$ 47	$ 46
Interest cost		40	40	42
Expected return on assets		(69)	(72)	(68)
Prior service credit		(1)	(7)	(8)
Actuarial loss (gain)		7	1	1
Net benefit cost		(10)	9	13
Curtailment gain		(8)	0	(3)
Settlement loss		13	7	3
Total net periodic benefit cost		(5)	16	13
U.S. Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		0	0	0
Interest cost		1	1	1
Expected return on assets		0	0	0
Prior service credit		(3)	(3)	(3)
Actuarial loss (gain)		(2)	(2)	(1)
Net benefit cost		(4)	(4)	(3)
Curtailment gain		0	0	0
Settlement loss		0	0	0
Total net periodic benefit cost		(4)	$ (4)	$ (3)
Non-U.S. Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	[1]	1
Interest cost	[1]	3
Expected return on assets	[1]	(4)
Prior service credit	[1]	0
Actuarial loss (gain)	[1]	0
Net benefit cost	[1]	0
Curtailment gain	[1]	0
Settlement loss	[1]	0
Total net periodic benefit cost	[1]	$ 0

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