CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net revenues	$ 3,023	$ 2,129
Cost of net revenues	823	502
Gross profit	2,200	1,627
Operating expenses:
Sales and marketing	687	520
Product development	318	232
General and administrative	258	207
Provision for transaction losses	88	96
Amortization of acquired intangible assets	7	7
Total operating expenses	1,358	1,062
Income from operations	842	565
Interest and other, net	(117)	1
Income from continuing operations before income taxes	725	566
Income tax provision	(156)	(135)
Income from continuing operations	569	431
Income from discontinued operations, net of income taxes	72	2,981
Net income	$ 641	$ 3,412
Income per share - basic:
Continuing operations (in usd per share)	$ 0.84	$ 0.57
Discontinued operations (in usd per share)	0.10	3.96
Net income per share - basic (in usd per share)	0.94	4.53
Income per share - diluted:
Continuing operations (in usd per share)	0.82	0.57
Discontinued operations (in usd per share)	0.10	3.94
Net income per share - diluted (in usd per share)	$ 0.92	$ 4.51
Weighted-average shares:
Basic (in shares)	681	753
Diluted (in shares)	693	757