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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Grants A summary of the status of the Company’s stock option grants as of December 31, 2017, 2016 and 2015, and changes during the years then ended, is presented in the following table:
 
2017
 
 
2016
 
 
2015
 
Options
Shares in
millions

 
Weighted-
average
exercise
price
 
 
Weighted-
average
remaining
contractual
life in years
 
Aggregate
intrinsic
value in
millions
 
 
Shares in
millions

 
Weighted-
average
exercise
price
 
 
Shares in
millions

 
Weighted-
average
exercise
price
 
Outstanding at beginning of year
21.5

 
 
$
92.25

 
 
 
 
 
 
21.9

 
 
$
84.76

 
23.4

 
 
$
77.99

Granted
4.0

 
 
128.74

 
 
 
 
 
 
4.3

 
 
117.10

 
4.3

 
 
97.33

Exercised
(5.6
)
 
 
81.77

 
 
 
 
 
 
(4.0
)
 
 
75.30

 
(5.1
)
 
 
62.59

Forfeited/expired
(1.0
)
 
 
118.38

 
 
 
 
 
 
(0.7
)
 
 
106.50

 
(0.7
)
 
 
96.76

Outstanding at end of year
18.9

 
 
$
101.55

 
6.3
 
 
$
1,331.4

 
21.5

 
 
$
92.25

 
21.9

 
 
$
84.76

Exercisable at end of year
11.3

 
 
$
90.73

 
4.9
 
 
$
917.8

 
13.4

 
 
 
 
13.4

 
 
 
Summary of Restricted Stock Unit Activity A summary of the Company’s RSU activity during the years ended December 31, 2017, 2016 and 2015 is presented in the following table:
 
2017
 
 
2016
 
 
2015
 
RSUs
Shares in
millions

 
Weighted-
average
grant date
fair value
 
 
Shares in
millions

 
Weighted-
average
grant date
fair value
 
 
Shares in
millions

 
Weighted-
average
grant date
fair value
 
Nonvested at beginning of year
1.9

 
 
$
94.13

 
2.4

 
 
$
83.50

 
2.2

 
 
$
83.49

Granted
0.6

 
 
123.98

 
0.7

 
 
109.86

 
0.9

 
 
87.03

Vested
(0.7
)
 
 
87.18

 
(0.8
)
 
 
79.54

 
(0.5
)
 
 
88.78

Forfeited
(0.2
)
 
 
117.24

 
(0.4
)
 
 
88.45

 
(0.2
)
 
 
85.82

Nonvested at end of year
1.6

 
 
$
107.34

 
1.9

 
 
$
94.13

 
2.4

 
 
$
83.50