CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net revenues	$ 2,649	$ 2,649	$ 7,979	$ 7,869
Cost of net revenues	627	608	1,858	1,764
Gross profit	2,022	2,041	6,121	6,105
Operating expenses:
Sales and marketing	806	852	2,365	2,446
Product development	313	307	932	993
General and administrative	283	248	866	886
Provision for transaction losses	76	65	219	203
Amortization of acquired intangible assets	12	13	37	36
Total operating expenses	1,490	1,485	4,419	4,564
Income from operations	532	556	1,702	1,541
Interest and other, net	(142)	392	(129)	661
Income before income taxes	390	948	1,573	2,202
Income tax provision	(80)	(228)	(339)	(437)
Income from continuing operations	310	720	1,234	1,765
Income (loss) from discontinued operations, net of income taxes	0	1	(4)	5
Net income	$ 310	$ 721	$ 1,230	$ 1,770
Income per share - basic:
Continuing operations (in usd per share)	$ 0.37	$ 0.74	$ 1.43	$ 1.78
Discontinued operations (in usd per share)	0	0	0	0
Net income per share - basic (in usd per share)	0.37	0.74	1.43	1.78
Income per share - diluted:
Continuing operations (in usd per share)	0.37	0.73	1.42	1.76
Discontinued operations (in usd per share)	0	0	0	0
Net income per share - diluted (in usd per share)	$ 0.37	$ 0.73	$ 1.42	$ 1.76
Weighted-average shares:
Basic (in shares)	830	974	863	992
Diluted (in shares)	837	983	870	1,005