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Share Repurchase Program - Schedule of Stock Repurchased (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Equity [Abstract]          
Purchases of treasury stock (in shares) 4.3 2.1 4.1 1.1  
Average price paid per share (in dollars per share) $ 106.98 $ 95.83 $ 97.70 $ 93.24  
Repurchase of common stock $ 465 $ 200 $ 401 $ 105 $ 1,066