Consolidated Statements of Operations (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Costs and expenses:
Amortization of intangible assets	$ 7us-gaap_AmortizationOfIntangibleAssets	$ 2us-gaap_AmortizationOfIntangibleAssets
Depreciation	14us-gaap_Depreciation	10us-gaap_Depreciation
Amortization adjustment	11us-gaap_AdjustmentForAmortization	6us-gaap_AdjustmentForAmortization
Stock-based compensation:
Stock-based compensation	16	14
Acquired technology
Costs and expenses:
Amortization of intangible assets	2
Website development costs
Costs and expenses:
Depreciation	9	6
Selling and Marketing
Stock-based compensation:
Stock-based compensation	4	3
Technology and Content
Stock-based compensation:
Stock-based compensation	6	6
General and Administrative
Stock-based compensation:
Stock-based compensation	$ 6	$ 5

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.

+ References

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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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