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Share-Based Compensation - Schedule of Additional Information Related to Stock Option and Restricted Stock Unit Activity (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share-based Payment Arrangement [Abstract]    
Total intrinsic value of stock options exercised $ 211 $ 119
Fair value of restricted stock units vested 158 36
Income tax benefit from stock options exercised and restricted stock units vested 89 36
Cash received from stock options exercised $ 73 $ 25