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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense and Related Tax Benefits (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]        
Stock-based compensation expense $ 13 $ 10 $ 25 $ 46
Total tax benefit $ 10 $ 3 $ 39 $ 34