CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net revenues	$ 2,580	$ 2,303
Cost of net revenues	559	514
Gross profit	2,021	1,789
Operating expenses:
Sales and marketing	756	648
Product development	334	278
General and administrative	270	245
Provision for transaction losses	72	62
Amortization of acquired intangible assets	10	9
Total operating expenses	1,442	1,242
Income from operations	579	547
Interest and other, net	(32)	11
Income before income taxes	547	558
Income tax benefit (provision)	(140)	477
Net income	$ 407	$ 1,035
Net income per share:
Net income per share - basic (in usd per share)	$ 0.40	$ 0.96
Net income per share - diluted (in usd per share)	$ 0.40	$ 0.94
Weighted-average shares:
Basic (in shares)	1,010	1,083
Diluted (in shares)	1,029	1,102