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Stockholders' Equity - Components of Share-based Compensation Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock based compensation expense |  |  |
Stock based compensation expense, Pretax charges | $ 26 | $ 23 | $ 22
Stock based compensation expense, Net-of-Tax Amount | 22 | 16 | 14
Restricted shares |  |  |
Stock based compensation expense |  |  |
Stock based compensation expense, Pretax charges | 20 | 19 | 19
Stock based compensation expense, Net-of-Tax Amount | 17 | 13 | 12
Employee stock purchase plan and stock options |  |  |
Stock based compensation expense |  |  |
Stock based compensation expense, Pretax charges | 6 | 4 | 3
Stock based compensation expense, Net-of-Tax Amount | $ 5 | $ 3 | $ 2

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- Definition 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) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References No definition available. + Details
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