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Stock-Based Compensation - Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Amounts recognized in the financial statements |  |  |  |
Stock-based compensation programs expense | $ 48 | $ 50 | $ 230 | $ 258
Income tax benefits | (12) | (20) | (120) | (137)
Stock-based compensation expenses (benefits), net of tax | 36 | 30 | 110 | 121
Cost of sales |  |  |  |
Amounts recognized in the financial statements |  |  |  |
Stock-based compensation programs expense | 8 | 8 | 39 | 40
Selling, general and administrative expenses |  |  |  |
Amounts recognized in the financial statements |  |  |  |
Stock-based compensation programs expense | 33 | 35 | 151 | 177
Research, development and related expenses |  |  |  |
Amounts recognized in the financial statements |  |  |  |
Stock-based compensation programs expense | $ 7 | $ 7 | $ 40 | $ 41

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