Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Costs and expenses:
Amortization of intangible assets	$ 8	$ 8	$ 16	$ 15
Depreciation	19	17	38	33
Amortization adjustment	15	12	29	24
Stock-based compensation:
Stock-based compensation	28	23	47	43
Selling and Marketing
Stock-based compensation:
Stock-based compensation	6	5	11	10
Technology and Content
Stock-based compensation:
Stock-based compensation	13	11	20	21
General and Administrative
Stock-based compensation:
Stock-based compensation	9	7	16	12
Acquired Technology
Costs and expenses:
Amortization of intangible assets	2	1	4	3
Website Development Costs
Costs and expenses:
Depreciation	$ 13	$ 11	$ 25	$ 21

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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