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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Payment Arrangement [Abstract] |  |  |  |
Options exercised (in shares) | 128,934 | 162,400 | 341,480 | 685,638
Cash received upon exercise | $ 12 | $ 12 | $ 31 | $ 55
Related tax benefit realized | $ 5 | $ 3 | $ 12 | $ 16

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