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Stock-Based Compensation - Compensation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amounts recognized in the financial statements |  |  |
Stock-based compensation programs expense | $ 324 | $ 298 | $ 276
Income tax benefits | (327) | (272) | (87)
Stock-based compensation expenses (benefits), net of tax | (3) | 26 | 189
ASU 2016-09 Improvements to Employee Share-Based Payment Accounting |  |  |
Amounts recognized in the financial statements |  |  |
Income tax benefits | (228) | (184) |
Cost of Sales |  |  |
Amounts recognized in the financial statements |  |  |
Stock-based compensation programs expense | 49 | 47 | 46
Selling, general and administrative expenses |  |  |
Amounts recognized in the financial statements |  |  |
Stock-based compensation programs expense | 229 | 206 | 185
Research, development and related expenses |  |  |
Amounts recognized in the financial statements |  |  |
Stock-based compensation programs expense | $ 46 | $ 45 | $ 45

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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=96867065&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=96867065&loc=d3e5070-113901 + Details
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