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Capital Stock (Tables)
12 Months Ended
Dec. 31, 2020
Capital Stock [Abstract]  
Schedule of Fair Value Assumptions
Option Value and Assumptions
202020192018
Weighted-average fair value per share$39.34 $36.30 $28.52 
Assumptions:
Risk-free interest rate1.4 %2.6 %2.7 %
Expected dividend yield1.0 %1.1 %1.2 %
Expected stock price volatility18.9 %18.3 %16.8 %
Expected option life (years)5.85.96.0
Summary of Stock Option Activity
2020 Stock Option Activity
Shares
(in millions)
Weighted
Average
Exercise Price
Weighted-Average
Remaining
Term (in years)
Aggregate
Intrinsic
Value
Outstanding January 112.8 $113.10 
Granted1.8 216.28 
Exercised(2.0)83.75 
Canceled(0.4)162.98 
Outstanding December 3112.2 $131.72 5.9$1,388.1 
Exercisable December 316.8 $99.09 4.4$995.7 
Options expected to vest4.9 $171.06 7.7$364.3 
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
RSUsPSUsRSUsPSUs
Nonvested on January 10.8 0.2 $158.80 $152.44 
Granted0.4 0.1 208.96 217.73 
Vested(0.4)(0.1)149.09 122.41 
Canceled or forfeited— — 154.38 166.99 
Nonvested on December 310.8 0.2 $187.72 $185.46