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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Operating Revenues      
Service revenues $ 6,302 $ 5,797 $ 5,352
Data processing revenues 5,552 5,167 4,642
International transaction revenues 4,064 3,560 3,389
Other revenues 823 770 716
Client incentives (2,861) (2,592) (2,321)
Total operating revenues 13,880 12,702 11,778
Operating Expenses      
Personnel 2,079 1,875 1,932
Marketing 872 900 876
Network and processing 474 507 468
Professional fees 336 328 412
Depreciation and amortization 494 435 397
General and administrative 547 507 451
Litigation provision (Note 20) 14 453 3
Total operating expenses 4,816 5,005 4,539
Operating income 9,064 7,697 7,239
Non-operating (expense) income (69) 27 18
Income before income taxes 8,995 7,724 7,257
Income tax provision (Note 19) 2,667 2,286 2,277
Net income $ 6,328 $ 5,438 $ 4,980
Class A common stock      
Earnings Per Share [Abstract]      
Basic earnings per share (Note 15) [1] $ 2.58 $ 2.16 $ 1.90
Basic weighted-average shares outstanding (Note 15) [1] 1,954 1,993 2,080
Diluted earnings per share (Note 15) [1] $ 2.58 $ 2.16 $ 1.90
Diluted weighted-average shares outstanding (Note 15) [1],[2] 2,457 2,523 2,624
Class B common stock      
Earnings Per Share [Abstract]      
Basic earnings per share (Note 15) [1],[3] $ 4.26 $ 3.63 $ 3.20
Basic weighted-average shares outstanding (Note 15) [1],[3] 245 245 245
Diluted earnings per share (Note 15) [1],[3] $ 4.25 $ 3.62 $ 3.19
Diluted weighted-average shares outstanding (Note 15) [1],[3] 245 245 245
Class C common stock      
Earnings Per Share [Abstract]      
Basic earnings per share (Note 15) [1],[3] $ 10.33 $ 8.65 $ 7.61
Basic weighted-average shares outstanding (Note 15) [1],[3] 22 26 28
Diluted earnings per share (Note 15) [1],[3] $ 10.30 $ 8.62 $ 7.59
Diluted weighted-average shares outstanding (Note 15) [1],[3] 22 26 28
[1] Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers. The number of shares and per share amounts for the prior periods presented have been retroactively adjusted to reflect the four-for-one stock split effected in the fiscal second quarter of 2015. See Note 14—Stockholders' Equity.
[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 6 million, 7 million and 8 million common stock equivalents for fiscal 2015, 2014 and 2013, respectively, because their effect would have been dilutive. The computation excludes 2 million of common stock equivalents for fiscal 2015, 2014 and 2013 because their effect would have been anti-dilutive.
[3] The outstanding number of shares of class B and C common stock were not impacted by the stock split as these stockholders received an adjustment to their respective conversion ratios instead of stock dividends. See Note 14—Stockholders' Equity. Weighted-average basic and diluted shares outstanding for class B and C common stock are calculated based on the common shares outstanding of each respective class rather than on an as-converted basis.