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Stock-based Compensation - Stock Option Activity (Details) - Stock Option Plans 2003 and 2013 - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Shares    
Beginning balance (in shares) 1.7 1.5
Granted (in shares) 0.3  
Exercised (in shares) (0.2) (0.3)
Forfeited (in shares) (0.2) (0.1)
Ending balance (in shares) 1.6 1.7
Options exercisable (in shares) 1.0  
Weighted Average Exercise Price    
Beginning balance weighted average exercise price (dollars per share) $ 58.93 $ 50.46
Granted weighted average exercise price (dollars per share) 61.84 69.04
Exercised weighted average exercise price (in dollars per share) 28.20 38.44
Forfeited weighted average exercise price (dollars per share) 60.45 67.45
Ending balance weighted average exercise price (dollars per share) 62.51 $ 58.93
Options exercisable weighted average exercise price (dollars per share) $ 59.93  
Options outstanding weighted average remaining contractual term (in years) 6 years 10 months 28 days  
Options outstanding weighted average intrinsic value $ 0.0  
Options exercisable weighted average remaining contractual term (in years) 5 years 10 months 14 days  
Options exercisable weighted average intrinsic value $ 0.0