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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Compensation |  |  |  |
Stock-based compensation expense | $ 54 | $ 53 | $ 110 | $ 108
Employee Stock Option |  |  |  |
Compensation |  |  |  |
Stock-based compensation expense | 11 | 14 | 25 | 34
Restricted Stock Units (RSUs) |  |  |  |
Compensation |  |  |  |
Stock-based compensation expense | $ 43 | $ 39 | $ 85 | $ 74

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