Stock-Based Compensation (Details 5) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before income taxes	$ 92	$ 104	$ 110
Stock-based compensation expense, income tax benefit	(27)	(38)	(40)
Total stock-based compensation expense, net of income tax benefit	65	66	70
Share-based Compensation, Included in Software Development Noncurrent [Roll Forward]
Stock-based compensation expense capitalized and deferred at the beginning of the period	26	22	19
Stock-based compensation expense capitalized and deferred during the period	36	27	34
Amortization of capitalized and deferred stock-based compensation expense	(34)	(23)	(31)
Stock-based compensation expense capitalized and deferred at the ending of the period	28	26	22
Cost of sales - online
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before income taxes	0	1	0
Cost of sales - software royalties and amortization
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before income taxes	15	17	17
Product development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before income taxes	25	22	33
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before income taxes	9	8	7
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before income taxes	$ 43	$ 56	$ 53

Amortization of capitalized stock-based compensation.

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Stock-based compensation capitalized as a component of software development.

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Share-based Compensation, Included in Software Development Noncurrent [Roll Forward]

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
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The amount of expense, net of income tax, 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 total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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