Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue		$ 1,492	$ 1,246	$ 945
Costs and expenses:
Cost of revenue	[1]	58	40	18
Selling and marketing	[1]	692	502	368
Technology and content	[2]	207	171	131
General and administrative (Note 12)	[2]	210	128	98
Depreciation		57	47	30
Amortization of intangible assets		36	18	6
Total costs and expenses		1,260	906	651
Operating income		232	340	294
Other income (expense):
Interest expense		(10)	(9)	(10)
Interest income and other, net (Note 17)		17	(9)
Total other income (expense), net		7	(18)	(10)
Income before income taxes		239	322	284
Provision for income taxes		(41)	(96)	(79)
Net income		$ 198	$ 226	$ 205
Earnings per share attributable to common stockholders (Note 2):
Basic		$ 1.38	$ 1.58	$ 1.44
Diluted		$ 1.36	$ 1.55	$ 1.41
Weighted average common shares outstanding (Note 2):
Basic		143,836	142,721	142,854
Diluted		145,967	145,800	145,263

[1] Excludes amortization expense as follows:

[2] Includes stock-based compensation expense as follows: