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Stock-based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Payment Arrangement [Abstract]        
RSUs and PSUs $ 33 $ 41 $ 66 $ 79
Stock options 3 6 9 12
Stock-based compensation expense, before income taxes 36 47 75 91
Related tax benefit (10) (12) (19) (23)
Stock-based compensation expense, net of tax benefit $ 26 $ 35 $ 56 $ 68