CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - 9 months ended Jun. 30, 2016 - USD ($) shares in Millions, $ in Millions		Total		Preferred Stock	Treasury Stock	Right to Recover for Covered Losses	Additional Paid-in Capital	Accumulated Income	Accumulated Other Comprehensive Loss	Series B Preferred Stock Preferred Stock		Series C Preferred Stock Preferred Stock		Class A common stock Common Stock	Class B common stock Common Stock	Class C common stock Common Stock
Beginning Balance (in shares) at Sep. 30, 2015										0	[1]	0	[1]	1,950	245	20
Beginning Balance at Sep. 30, 2015		$ 29,842		$ 0	$ 0	$ 0	$ 18,073	$ 11,843	$ (74)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		4,060	[2]					4,060
Other comprehensive loss, net of tax		(469)							(469)
Comprehensive (loss) income		3,591
Issuance of preferred stock (Note 2 and Note 9) (in shares)	[1]									2		3
Issuance of preferred stock (Note 2 and Note 9)		5,717		5,717
VE territory covered losses incurred (Note 3)		(25)				(25)
Class C common stock held by Visa Europe, a wholly-owned subsidiary of Visa Inc. (Note 2 and Note 9) (in shares)																(1)
Class C common stock held by Visa Europe, a wholly-owned subsidiary of Visa Inc. (Note 2 and Note 9)		(170)			(170)
Conversion of class C common stock upon sale into public market (in shares)														8		(2)
Issuance and vesting of restricted stock and performance-based shares (in shares)														2
Issuance and vesting of restricted stock and performance-based shares		0
Share-based compensation, net of forfeitures (Note 11) (in shares)	[3]													0
Share-based compensation, net of forfeitures (Note 11)		152					152
Restricted stock and performance-based shares settled in cash for taxes (shares)														(1)
Restricted stock and performance-based shares settled in cash for taxes		(89)					(89)
Excess tax benefit for share-based compensation		51					51
Cash proceeds from issuance of common stock under equity plans (in shares)														2
Cash proceeds from issuance of common stock under employee equity plans		69					69
Cash dividends declared and paid, at a quarterly amount of $0.14 per as-converted share (Note 9)		$ (1,011)						(1,011)
Repurchase of class A common stock (Note 9) (in shares)		(70)	[4],[5]											(70)
Repurchase of class A common stock (Note 9)		$ (5,300)	[5]				(742)	(4,558)
Ending Balance (in shares) at Jun. 30, 2016										2	[1]	3	[1]	1,891	245	17
Ending Balance at Jun. 30, 2016		$ 32,827		$ 5,717	$ (170)	$ (25)	$ 17,514	$ 10,334	$ (543)

[1] Series B and C preferred stock are alternatively referred to as U.K.&I and Europe preferred stock, respectively.

[2] Net income is allocated based on proportional ownership on an as-converted basis. The weighted-average number of shares of as-converted class B common stock used in the income allocation was 405 million for the three and nine months ended June 30, 2016 and 2015. The weighted-average number of shares of as-converted class C common stock used in the income allocation was 73 million and 76 million for the three and nine months ended June 30, 2016, respectively, and 78 million and 82 million for the three and nine months ended June 30, 2015, respectively.

[3] Decrease in class A common stock related to forfeitures of restricted stock awards is less than 1 million shares.

[4] All shares repurchased in the open market have been retired and constitute authorized but unissued shares.

[5] Shares repurchased in the open market reflect repurchases settled on or before June 30, 2016. The Company repurchased an additional 2 million shares for $150 million at the end of June, which did not settle until July 2016.