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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, 2020 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	12.8
Shares, Granted (in shares) | shares	1.8
Shares, Exercised (in shares) | shares	(2.0)
Shares, Cancelled (in shares) | shares	(0.4)
Shares, Options outstanding at December 31 (in shares) | shares	12.2
Shares, Exercisable at December 31 (in shares) | shares	6.8
Shares, Options expected to vest (in shares) | shares	4.9
Weighted Average Exercise Price
Weighted average exercise price, Options outstanding at January 1 (in dollars per share) | $ / shares	$ 113.10
Weighted average exercise price, Granted (in dollars per share) | $ / shares	216.28
Weighted average exercise price, Exercised (in dollars per share) | $ / shares	83.75
Weighted average exercise price, Cancelled (in dollars per share) | $ / shares	162.98
Weighted average exercise price, Options outstanding at December 31 (in dollars per share) | $ / shares	131.72
Weighted average exercise price, Exercisable at December 31 (in dollars per share) | $ / shares	99.09
Weighted average exercise price, Options expected to vest (in dollars per share) | $ / shares	$ 171.06
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)	5 years 10 months 24 days
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 | $	$ 1,388.1
Aggregate intrinsic value, Exercisable at December 31 | $	995.7
Aggregate intrinsic value, Options expected to vest | $	$ 364.3

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