CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net revenues	$ 2,501	$ 2,258	$ 7,807	$ 6,416
Cost of net revenues	678	478	1,956	1,249
Gross profit	1,823	1,780	5,851	5,167
Operating expenses:
Sales and marketing	496	528	1,601	1,445
Product development	334	271	988	745
General and administrative	219	253	715	737
Provision for transaction losses	112	60	303	245
Amortization of acquired intangible assets	0	6	9	20
Total operating expenses	1,161	1,118	3,616	3,192
Income from operations	662	662	2,235	1,975
Interest and other, net	(228)	94	(676)	276
Income from continuing operations before income taxes	434	756	1,559	2,251
Income tax provision	(151)	(151)	(414)	(536)
Income from continuing operations	283	605	1,145	1,715
Income (loss) from discontinued operations, net of income taxes	(19)	59	10,494	3,107
Net income	$ 264	$ 664	$ 11,639	$ 4,822
Income (loss) per share - basic:
Continuing operations (in usd per share)	$ 0.44	$ 0.87	$ 1.72	$ 2.39
Discontinued operations (in usd per share)	(0.03)	0.08	15.72	4.33
Net income per share - basic (in usd per share)	0.41	0.95	17.44	6.72
Income (loss) per share - diluted:
Continuing operations (in usd per share)	0.43	0.86	1.69	2.37
Discontinued operations (in usd per share)	(0.03)	0.08	15.47	4.28
Net income per share - diluted (in usd per share)	$ 0.40	$ 0.94	$ 17.16	$ 6.65
Weighted-average shares:
Basic (in shares)	647	696	667	717
Diluted (in shares)	658	708	678	725