CONSOLIDATED STATEMENT OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net revenues	$ 10,746	$ 9,927	$ 9,298
Cost of net revenues	2,382	2,221	2,004
Gross profit	8,364	7,706	7,294
Operating expenses:
Sales and marketing	3,391	2,878	2,691
Product development	1,285	1,224	1,114
General and administrative	1,131	1,030	899
Provision for transaction losses	286	272	231
Amortization of acquired intangible assets	49	38	34
Total operating expenses	6,142	5,442	4,969
Income from operations	2,222	2,264	2,325
Interest and other, net	496	11	1,326
Income from continuing operations before income taxes	2,718	2,275	3,651
Income tax benefit (provision)	(190)	(3,288)	3,634
Income (loss) from continuing operations	2,528	(1,013)	7,285
Income (loss) from discontinued operations, net of income taxes	2	(4)	(19)
Net income (loss)	$ 2,530	$ (1,017)	$ 7,266
Income (loss) per share - basic:
Continuing operations (in usd per share)	$ 2.58	$ (0.95)	$ 6.43
Discontinued operations (in usd per share)	0	0	(0.02)
Net income (loss) per share - basic (in usd per share)	2.58	(0.95)	6.41
Income (loss) per share - diluted:
Continuing operations (in usd per share)	2.55	(0.95)	6.37
Discontinued operations (in usd per share)	0	0	(0.02)
Net income (loss) per share - diluted (in usd per share)	$ 2.55	$ (0.95)	$ 6.35
Weighted average shares:
Basic (in shares)	980	1,064	1,133
Diluted (in shares)	991	1,064	1,144