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Stock-Based Compensation - Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Amounts recognized in the financial statements |  |  |  |
Stock-based compensation expenses | $ 43 | $ 44 | $ 227 | $ 216
Income tax benefits | (13) | (13) | (89) | (67)
Stock-based compensation expenses (benefits), net of tax | 30 | 31 | 138 | 149
Cost of sales |  |  |  |
Amounts recognized in the financial statements |  |  |  |
Stock-based compensation expenses | 8 | 9 | 39 | 41
Selling, general and administrative expenses |  |  |  |
Amounts recognized in the financial statements |  |  |  |
Stock-based compensation expenses | 30 | 30 | 151 | 138
Research, development and related expenses |  |  |  |
Amounts recognized in the financial statements |  |  |  |
Stock-based compensation expenses | $ 5 | $ 5 | $ 37 | $ 37

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