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Stock-Based Compensation - Summary of Stock Options Exercised (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement [Abstract]      
Options exercised (in shares) 770,597 840,175 1,789,939
Total intrinsic value $ 86 $ 72 $ 114
Cash received upon exercise 53 58 104
Related tax benefits realized $ 18 $ 16 $ 35