CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net revenues	$ 2,668	$ 2,337	$ 5,306	$ 4,158
Cost of net revenues	672	417	1,278	771
Gross profit	1,996	1,920	4,028	3,387
Operating expenses:
Sales and marketing	559	523	1,105	917
Product development	350	256	654	474
General and administrative	250	281	496	484
Provision for transaction losses	103	89	191	185
Amortization of acquired intangible assets	2	7	9	14
Total operating expenses	1,264	1,156	2,455	2,074
Income from operations	732	764	1,573	1,313
Interest and other, net	(331)	181	(448)	182
Income from continuing operations before income taxes	401	945	1,125	1,495
Income tax provision	(107)	(256)	(263)	(385)
Income from continuing operations	294	689	862	1,110
Income from discontinued operations, net of income taxes	10,440	57	10,513	3,048
Net income	$ 10,734	$ 746	$ 11,375	$ 4,158
Income per share - basic:
Continuing operations (in usd per share)	$ 0.44	$ 0.98	$ 1.27	$ 1.53
Discontinued operations (in usd per share)	15.48	0.08	15.52	4.18
Net income per share - basic (in usd per share)	15.92	1.06	16.79	5.71
Income per share - diluted:
Continuing operations (in usd per share)	0.43	0.97	1.25	1.51
Discontinued operations (in usd per share)	15.25	0.08	15.27	4.16
Net income per share - diluted (in usd per share)	$ 15.68	$ 1.05	$ 16.52	$ 5.67
Weighted-average shares:
Basic (in shares)	674	703	678	728
Diluted (in shares)	685	711	689	734