CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Revenues
Net revenues	$ 5,854	$ 5,494	$ 11,908	$ 11,000
Operating Expenses
Personnel	940	894	1,922	1,701
Marketing	235	241	509	517
Network and processing	183	171	364	344
Professional fees	103	101	209	192
Depreciation and amortization	192	160	374	319
General and administrative	269	264	582	540
Litigation provision (Note 14)	8	22	8	29
Total operating expenses	1,930	1,853	3,968	3,642
Operating income	3,924	3,641	7,940	7,358
Non-operating Income (Expense)
Interest expense, net	(118)	(140)	(229)	(285)
Investment income and other	23	176	92	234
Total non-operating income (expense)	(95)	36	(137)	(51)
Income before income taxes	3,829	3,677	7,803	7,307
Income tax provision (Note 13)	745	700	1,447	1,353
Net income	$ 3,084	$ 2,977	$ 6,356	$ 5,954
Class A common stock
Earnings Per Share
Basic earnings per share (in dollars per share)	$ 1.39	$ 1.31	$ 2.85	$ 2.61
Basic weighted-average shares outstanding (in shares)	1,703	1,748	1,708	1,754
Diluted earnings per share (in dollars per share)	$ 1.38	$ 1.31	$ 2.85	$ 2.61
Diluted weighted-average shares outstanding (in shares)	2,228	2,279	2,234	2,285
Class B common stock
Earnings Per Share
Basic earnings per share (in dollars per share)	$ 2.25	$ 2.13	$ 4.62	$ 4.25
Basic weighted-average shares outstanding (in shares)	245	245	245	245
Diluted earnings per share (in dollars per share)	$ 2.25	$ 2.13	$ 4.62	$ 4.25
Diluted weighted-average shares outstanding (in shares)	245	245	245	245
Class C common stock
Earnings Per Share
Basic earnings per share (in dollars per share)	$ 5.54	$ 5.23	$ 11.40	$ 10.44
Basic weighted-average shares outstanding (in shares)	11	12	11	12
Diluted earnings per share (in dollars per share)	$ 5.54	$ 5.23	$ 11.38	$ 10.42
Diluted weighted-average shares outstanding (in shares)	11	12	11	12