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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015, 2014 and 2013, and changes during the years then ended, is presented in the following table:
 
2015
 
 
2014
 
 
2013
 
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
23.4

 
 
$
77.99

 
 
 
 
 
 
25.1

 
 
$
69.15

 
27.4

 
 
$
59.86

Granted
4.3

 
 
97.33

 
 
 
 
 
 
3.9

 
 
95.13

 
3.7

 
 
94.36

Exercised
(5.1
)
 
 
62.59

 
 
 
 
 
 
(5.1
)
 
 
46.09

 
(5.7
)
 
 
40.12

Forfeited/expired
(0.7
)
 
 
96.76

 
 
 
 
 
 
(0.5
)
 
 
94.56

 
(0.3
)
 
 
79.15

Outstanding at end of year
21.9

 
 
$
84.76

 
6.2
 
 
$
730.7

 
23.4

 
 
$
77.99

 
25.1

 
 
$
69.15

Exercisable at end of year
13.4

 
 
$
77.31

 
4.9
 
 
$
546.5

 
14.4

 
 
 
 
15.6

 
 
 
Summary of Restricted Stock Unit Activity
A summary of the Company’s RSU activity during the years ended December 31, 2015, 2014 and 2013 is presented in the following table:
 
2015
 
 
2014
 
 
2013
 
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
2.2

 
 
$
83.49

 
2.0

 
 
$
78.89

 
1.8

 
 
$
68.23

Granted
0.9

 
 
87.03

 
0.9

 
 
85.12

 
1.0

 
 
83.98

Vested
(0.5
)
 
 
88.78

 
(0.6
)
 
 
69.29

 
(0.7
)
 
 
56.93

Forfeited
(0.2
)
 
 
85.82

 
(0.1
)
 
 
85.16

 
(0.1
)
 
 
82.44

Nonvested at end of year
2.4

 
 
$
83.50

 
2.2

 
 
$
83.49

 
2.0

 
 
$
78.89