Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Costs and expenses:
Amortization of intangible assets	$ 8	$ 9	$ 15	$ 16
Depreciation	17	15	33	28
Amortization adjustment	12	13	24	24
Stock-based compensation:
Stock-based compensation	22	18	42	34
Selling and Marketing
Stock-based compensation:
Stock-based compensation	5	4	10	8
Technology and Content
Stock-based compensation:
Stock-based compensation	10	7	20	13
General and Administrative
Stock-based compensation:
Stock-based compensation	7	7	12	13
Acquired Technology
Costs and expenses:
Amortization of intangible assets	1	3	3	5
Website Development Costs
Costs and expenses:
Depreciation	$ 11	$ 10	$ 21	$ 19

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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