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Employee Stock and Savings Plans - Schedule of Additional Information Related to Stock Option and Restricted Stock Unit Activity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Total intrinsic value of stock options exercised $ 147 $ 116 $ 113
Fair value of restricted stock units vested 37 61 58
Income tax benefit from stock options exercised and restricted stock units vested 43 66 62
Cash received from stock options exercised $ 29 $ 36 $ 39