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Stock-Based Compensation - Schedule of Options Exercised, Cash Received, and Related Tax Benefits (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]        
Options exercised (in shares) 22,502 313,358 363,982 998,996
Cash received upon exercise $ 2 $ 27 $ 33 $ 82
Related tax benefit realized $ 1 $ 8 $ 13 $ 24