CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Operating Revenues
Service revenues		$ 2,146	$ 1,918
Data processing revenues		2,147	1,892
International transaction revenues		1,666	1,489
Other revenues		229	203
Client incentives		(1,326)	(1,041)
Net operating revenues		4,862	4,461
Operating Expenses
Personnel		679	571
Marketing		223	218
Network and processing		160	145
Professional fees		92	80
Depreciation and amortization		145	146
General and administrative		236	186
Litigation provision (Note 11)		0	15
Total operating expenses		1,535	1,361
Operating income		3,327	3,100
Non-operating Income (Expense)
Interest expense		(154)	(140)
Other		66	19
Total non-operating expense		(88)	(121)
Income before income taxes		3,239	2,979
Income tax provision (Note 10)		717	909
Net income		$ 2,522	$ 2,070
Class A common stock
Earnings Per Share
Basic earnings per share (in dollars per share)	[1]	$ 1.07	$ 0.86
Basic weighted-average shares outstanding (in shares)		1,811	1,860
Diluted earnings per share (in dollars per share)	[1]	$ 1.07	$ 0.86
Diluted weighted-average shares outstanding (in shares)	[2]	2,353	2,421
Class B common stock
Earnings Per Share
Basic earnings per share (in dollars per share)	[1]	$ 1.77	$ 1.41
Basic weighted-average shares outstanding (in shares)		245	245
Diluted earnings per share (in dollars per share)	[1]	$ 1.77	$ 1.41
Diluted weighted-average shares outstanding (in shares)		245	245
Class C common stock
Earnings Per Share
Basic earnings per share (in dollars per share)	[1]	$ 4.30	$ 3.43
Basic weighted-average shares outstanding (in shares)		13	17
Diluted earnings per share (in dollars per share)	[1]	$ 4.29	$ 3.42
Diluted weighted-average shares outstanding (in shares)		13	17

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

[2] 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 approximately 5 million common stock equivalents for the three months ended December 31, 2017 and 2016, because their effect would be dilutive. The computation excludes 2 million and 3 million of common stock equivalents for the three months ended December 31, 2017 and 2016, respectively, because their effect would have been anti-dilutive.