CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Net revenues	$ 5,729	$ 5,854	$ 11,416	$ 11,908
Operating Expenses
Personnel	1,114	940	2,095	1,922
Marketing	206	235	411	509
Network and processing	179	183	352	364
Professional fees	82	103	165	209
Depreciation and amortization	201	192	398	374
General and administrative	363	269	566	582
Litigation provision	3	8	4	8
Total operating expenses	2,148	1,930	3,991	3,968
Operating income	3,581	3,924	7,425	7,940
Non-operating Income (Expense)
Interest expense, net	(121)	(118)	(257)	(229)
Investment income and other	168	23	208	92
Total non-operating income (expense)	47	(95)	(49)	(137)
Income before income taxes	3,628	3,829	7,376	7,803
Income tax provision	602	745	1,224	1,447
Net income	$ 3,026	$ 3,084	$ 6,152	$ 6,356
Class A common stock
Earnings Per Share
Basic Earnings Per Share (in dollars per share)	$ 1.38	$ 1.39	$ 2.80	$ 2.85
Basic Weighted-average Shares Outstanding (in shares)	1,695	1,703	1,695	1,708
Diluted Earnings Per Share (in dollars per share)	$ 1.38	$ 1.38	$ 2.80	$ 2.85
Diluted Weighted-average Shares Outstanding (in shares)	2,193	2,228	2,196	2,234
Class B common stock
Earnings Per Share
Basic Earnings Per Share (in dollars per share)	$ 2.24	$ 2.25	$ 4.55	$ 4.62
Basic Weighted-average Shares Outstanding (in shares)	245	245	245	245
Diluted Earnings Per Share (in dollars per share)	$ 2.24	$ 2.25	$ 4.54	$ 4.62
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)	$ 5.52	$ 5.54	$ 11.22	$ 11.40
Basic Weighted-average Shares Outstanding (in shares)	11	11	11	11
Diluted Earnings Per Share (in dollars per share)	$ 5.52	$ 5.54	$ 11.20	$ 11.38
Diluted Weighted-average Shares Outstanding (in shares)	11	11	11	11