CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Operating Revenues
Service revenues		$ 8,918	$ 7,975	$ 6,747	[1]
Data processing revenues		9,027	7,786	6,272	[1]
International transaction revenues		7,211	6,321	4,649	[1]
Other revenue, net		944	841	823	[1]
Client incentives		(5,491)	(4,565)	(3,409)	[1]
Net operating revenues		20,609	18,358	15,082	[1]
Operating Expenses
Personnel		3,170	2,628	2,226	[1]
Marketing		988	922	869	[1]
Network and processing		686	620	538	[1]
Professional fees		446	409	389	[1]
Depreciation and amortization		613	556	502	[1]
General and administrative		1,145	1,060	796	[1]
Litigation provision (Note 17)		607	19	2	[1]
Visa Europe Framework Agreement loss		0	0	1,877	[1]
Total operating expenses		7,655	6,214	7,199	[1]
Operating income		12,954	12,144	7,883	[1]
Non-operating Income (Expense)
Interest expense		(612)	(563)	(427)	[1]
Other		464	113	556	[1]
Total non-operating income (expense)		(148)	(450)	129	[1]
Income before income taxes		12,806	11,694	8,012	[1]
Income tax provision (Note 16)		2,505	4,995	2,021	[1]
Net income		$ 10,301	$ 6,699	$ 5,991	[1]
Class A common stock
Earnings Per Share [Abstract]
Basic earnings per share (Note 12) (in dollars per share)		$ 4.43	$ 2.80	$ 2.49	[2]
Basic weighted-average shares outstanding (Note 12) (in shares)		1,792	1,845	1,906
Diluted earnings per share (Note 12) (in dollars per share)	[2]	$ 4.42	$ 2.80	$ 2.48
Diluted weighted-average shares outstanding (Note 12) (in shares)	[3]	2,329	2,395	2,414
Class B common stock
Earnings Per Share [Abstract]
Basic earnings per share (Note 12) (in dollars per share)		$ 7.28	$ 4.62	$ 4.10	[2]
Basic weighted-average shares outstanding (Note 12) (in shares)		245	245	245
Diluted earnings per share (Note 12) (in dollars per share)	[2]	$ 7.27	$ 4.61	$ 4.09
Diluted weighted-average shares outstanding (Note 12) (in shares)		245	245	245
Class C common stock
Earnings Per Share [Abstract]
Basic earnings per share (Note 12) (in dollars per share)		$ 17.72	$ 11.21	$ 9.94	[2]
Basic weighted-average shares outstanding (Note 12) (in shares)		12	14	19
Diluted earnings per share (Note 12) (in dollars per share)	[2]	$ 17.69	$ 11.19	$ 9.93
Diluted weighted-average shares outstanding (Note 12) (in shares)		12	14	19

[1] The Company did not include Visa Europe’s financial results in the Company’s consolidated statements of operations from the acquisition date, June 21, 2016, through June 30, 2016 as the impact was immaterial. The Company’s consolidated statement of operations for the year ended September 30, 2016 includes Visa Europe’s financial results for the three months ended September 30, 2016.

[2] Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.

[3] Weighted-average diluted shares outstanding are calculated on an as-converted basis, and include incremental common stock equivalents, as calculated under the treasury stock method. The computation includes 3 million common stock equivalents for fiscal 2018, and 5 million common stock equivalents for fiscal 2017 and 2016, because their effect would have been dilutive. The computation excludes 1 million of common stock equivalents for fiscal 2018, and 2 million of common stock equivalents for fiscal 2017 and 2016, because their effect would have been anti-dilutive.