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Capital Stock (Summary of Stock Option Activity) (Details)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Shares, Options outstanding at January 1 (in shares) | shares 14.1
Shares, Granted (in shares) | shares 2.1
Shares, Exercised (in shares) | shares (2.6)
Shares, Cancelled (in shares) | shares (0.8)
Shares, Options outstanding at December 31 (in shares) | shares 12.8
Shares, Exercisable at December 31 (in shares) | shares 6.8
Shares, Options expected to vest (in shares) | shares 5.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Weighted average exercise price, Options outstanding at January 1 (in dollars per share) | $ / shares $ 97.69
Weighted average exercise price, Granted (in dollars per share) | $ / shares 179.41
Weighted average exercise price, Exercised (in dollars per share) | $ / shares 75.74
Weighted average exercise price, Cancelled (in dollars per share) | $ / shares 134.73
Weighted average exercise price, Options outstanding at December 31 (in dollars per share) | $ / shares 113.10
Weighted average exercise price, Exercisable at December 31 (in dollars per share) | $ / shares 85.62
Weighted average exercise price, Options expected to vest (in dollars per share) | $ / shares $ 143.38
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted-average remaining contractual term, Options outstanding at December 31 (in years) 6 years
Weighted-average remaining contractual term, Exercisable at December 31 (in years) 4 years 4 months 24 days
Weighted-average remaining contractual term, Options expected to vest (in years) 7 years 8 months 12 days
Aggregate intrinsic value, Options outstanding at December 31 | $ $ 1,242.8
Aggregate intrinsic value, Exercisable at December 31 | $ 853.2
Aggregate intrinsic value, Options expected to vest | $ $ 360.8