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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2018
Capital Stock [Abstract]  
Schedule of Fair Value Assumptions
Option Value and Assumptions
 
2018
 
2017
 
2016
Weighted-average fair value per share
$
28.52

 
$
22.43

 
$
17.73

Assumptions:
 
 
 
 
 
Risk-free interest rate
2.7
%
 
2.0
%
 
1.3
%
Expected dividend yield
1.2
%
 
1.5
%
 
1.6
%
Expected stock price volatility
16.8
%
 
19.4
%
 
20.5
%
Expected option life (years)
6.0

 
6.0

 
6.1
Summary of Stock Option Activity
2018 Stock Option Activity
 
Shares
(in millions)
 
Weighted
Average
Exercise Price
 
Weighted-Average
Remaining
Term
(in years)
 
Aggregate
Intrinsic
Value
Outstanding January 1
14.7

 
$
83.71

 
 
 
 
Granted
2.4

 
154.50

 
 
 
 
Exercised
(2.5
)
 
66.98

 
 
 
 
Canceled
(0.5
)
 
114.98

 
 
 
 
Outstanding December 31
14.1

 
$
97.69

 
6.1
 
$
834.5

Exercisable December 31
7.3

 
$
74.10

 
4.4
 
$
598.4

Options expected to vest
6.2

 
$
121.48

 
7.8
 
$
220.7
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
1.0

 
0.3

 
$
104.85

 
$
104.51

Granted
0.5

 
0.1

 
150.23

 
153.67

Vested
(0.5
)
 
(0.1
)
 
100.32

 
92.96

Canceled or forfeited
(0.1
)
 
—

 
117.86

 
—

Nonvested on December 31
0.9

 
0.3

 
$
129.90

 
$
122.39