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Stock-Based Compensation - Schedule of Options Exercised, Cash Received, and Related Tax Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |  |  |  |
Stock options exercised (in shares) | 162,400 | 215,546 | 685,638 | 621,917
Cash received upon exercise | $ 12 | $ 16 | $ 55 | $ 44
Related tax benefit realized | $ 3 | $ 6 | $ 16 | $ 15

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