Capital Stock (Tables)

12 Months Ended

Dec. 31, 2021

Capital Stock [Abstract]

Schedule of Fair Value Assumptions

Option Value and Assumptions
	2021			2020			2019
Weighted-average fair value per share	$	53.35		$	39.34		$	36.30
Assumptions:
Risk-free interest rate	0.8		%	1.4		%	2.6		%
Expected dividend yield	1.2		%	1.0		%	1.1		%
Expected stock price volatility	26.9		%	18.9		%	18.3		%
Expected option life (years)	5.9			5.8			5.9

Summary of Stock Option Activity

2021 Stock Option Activity
	Shares (in millions)	Weighted Average Exercise Price		Weighted-Average Remaining Term (in years)	Aggregate Intrinsic  Value
Outstanding January 1	12.2	$	131.72
Granted	1.8	235.35
Exercised	(1.6)	96.41
Canceled or forfeited	(0.3)	192.60
Outstanding December 31	12.1	$	150.17	5.7	$	1,424.2
Exercisable December 31	7.1	$	113.56	4.2	$	1,086.3
Options expected to vest	4.6	$	199.41	7.7	$	313.3

Summary of RSU and PSU Activity

Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) Activity
	Shares (in millions)		Weighted Average Grant Date Fair Value
	RSUs	PSUs	RSUs		PSUs
Nonvested on January 1	0.8	0.2	$	187.72	$	185.46
Granted	0.4	0.1	230.61		233.95
Vested	(0.4)	(0.1)	179.15		153.67
Canceled or forfeited	(0.1)	—	187.38		160.11
Nonvested on December 31	0.7	0.2	$	213.16	$	210.73