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Stock-Based Compensation - Stock Option Activity (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Options, Outstanding, Shares  
Options, Beginning balance (shares) | shares 2.1
Shares, granted (shares) | shares 0.2
Shares, exercised (shares) | shares (0.6)
Shares, forfeited and expired (shares) | shares 0.0
Options, Ending balance (shares) | shares 1.7
Weighted average exercise price  
Weighted-average exercise price, Beginning balance (USD per share) | $ / shares $ 44.09
Weighted-average exercise price, granted (USD per share) | $ / shares 74.11
Weighted-average exercise price, exercised (USD per share) | $ / shares 161.14
Weighted-average exercise price, forfeited and expired (USD per share) | $ / shares 71.68
Weighted-average exercise price, Ending balance (USD per share) | $ / shares $ 47.92
Shares, options exercisable (shares) | shares 1.6
Weighted-average exercise price, options exercisable (USD per share) | $ / shares $ 46.69
Weighted-average remaining years of contractual term, Options outstanding 3 years 3 months 18 days
Weighted-average remaining years of contractual term, Options exercisable 3 years 1 month 6 days
Aggregate intrinsic value, options outstanding | $ $ 202
Aggregate intrinsic value, options exercisable | $ $ 195
Nonvested Options Outstanding  
Shares, granted (shares) | shares 0.2
Weighted-average grant-date fair value  
Weighted-average exercise price, granted (USD per share) | $ / shares $ 74.11
Non Vested Options  
Options, Outstanding, Shares  
Shares, granted (shares) | shares 0.2
Weighted average exercise price  
Weighted-average exercise price, granted (USD per share) | $ / shares $ 112.98
Nonvested Options Outstanding  
Options, Beginning balance (shares) | shares 0.0
Shares, granted (shares) | shares 0.2
Shares, vested (shares) | shares (0.1)
Shares, forfeited (shares) | shares 0.0
Options, Ending balance (shares) | shares 0.1
Weighted-average grant-date fair value  
Weighted-average grant-date fair value, Beginning balance (USD per share) | $ / shares $ 27.52
Weighted-average exercise price, granted (USD per share) | $ / shares 112.98
Weighted-average grant-date fair value, vested (USD per share) | $ / shares 112.36
Weighted-average exercise price, forfeited (USD per share) | $ / shares 112.14
Weighted-average grant-date fair value, Beginning balance (USD per share) | $ / shares $ 113.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Total unrecognized compensation expense related to nonvested options | $ $ 2
Weighted-average years to be recognized over 2 years