CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2016		Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 412	[1]	$ 1,697	$ 4,060	[1]	$ 4,816
Investment securities, available-for-sale:
Net unrealized (loss) gain	(18)		(2)	42		(21)
Income tax effect	8		1	(15)		8
Reclassification adjustment for net gain realized in net income	0		0	(3)		(21)
Income tax effect	0		0	1		8
Defined benefit pension and other postretirement plans:
Net unrealized actuarial gain and prior service credit	0		0	61		0
Income tax effect	0		0	(23)		0
Amortization of actuarial gain and prior service credit realized in net income	0		(3)	(5)		(3)
Income tax effect	0		1	2		1
Derivative instruments classified as cash flow hedges:
Net unrealized (loss) gain	(22)		(10)	(60)		118
Income tax effect	3		4	9		(33)
Reclassification adjustment for net gain realized in net income	(22)		(35)	(107)		(61)
Income tax effect	8		9	33		16
Foreign currency translation adjustments	(404)		0	(404)		1
Other comprehensive (loss) income, net of tax	(447)		(35)	(469)		13
Comprehensive (loss) income	$ (35)		$ 1,662	$ 3,591		$ 4,829

[1] The Company did not include Visa Europe's financial results in the Company's unaudited consolidated statements of operations from the acquisition date, June 21, 2016, through June 30, 2016 as the impact is immaterial. See Note 2—Visa Europe to these unaudited consolidated financial statements.