CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Revenues
Net revenues		$ 5,494	$ 5,073	$ 11,000	$ 9,935
Operating Expenses
Personnel		894	824	1,701	1,503
Marketing		241	261	517	484
Network and processing		171	169	344	329
Professional fees		101	108	192	200
Depreciation and amortization		160	153	319	298
General and administrative		264	222	540	458
Litigation provision (Note 13)		22	0	29	0
Total operating expenses		1,853	1,737	3,642	3,272
Operating income		3,641	3,336	7,358	6,663
Non-operating Income (Expense)
Interest expense, net		(140)	(153)	(285)	(307)
Investment income and other		176	34	234	100
Total non-operating income (expense)		36	(119)	(51)	(207)
Income before income taxes		3,677	3,217	7,307	6,456
Income tax provision (Note 12)		700	612	1,353	1,329
Net income		$ 2,977	$ 2,605	$ 5,954	$ 5,127
Class A common stock
Earnings Per Share
Basic earnings per share (in dollars per share)	[1]	$ 1.31	$ 1.12	$ 2.61	$ 2.19
Basic weighted-average shares outstanding (in shares)		1,748	1,798	1,754	1,805
Diluted earnings per share (in dollars per share)	[1]	$ 1.31	$ 1.11	$ 2.61	$ 2.19
Diluted weighted-average shares outstanding (in shares)	[2]	2,279	2,337	2,285	2,345
Class B common stock
Earnings Per Share
Basic earnings per share (in dollars per share)	[1]	$ 2.13	$ 1.84	$ 4.25	$ 3.61
Basic weighted-average shares outstanding (in shares)		245	245	245	245
Diluted earnings per share (in dollars per share)	[1]	$ 2.13	$ 1.84	$ 4.25	$ 3.60
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)	[1]	$ 5.23	$ 4.46	$ 10.44	$ 8.76
Basic weighted-average shares outstanding (in shares)		12	12	12	13
Diluted earnings per share (in dollars per share)	[1]	$ 5.23	$ 4.46	$ 10.42	$ 8.74
Diluted weighted-average shares outstanding (in shares)		12	12	12	13

[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 3 million common stock equivalents for the three and six months ended March 31, 2019 and 4 million common stock equivalents for the three and six months ended March 31, 2018, because their effect would have been dilutive. The computation excludes 1 million of common stock equivalents for the three and six months ended March 31, 2019, and 2 million of common stock equivalents for the three and six months ended March 31, 2018, because their effect would have been anti-dilutive.