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Share-based Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted Average Black-Scholes Assumptions
Based on the results of the model, the weighted-average grant date fair value of stock options granted for 2014, 2013, and 2012 were $42.09, $33.92 and $19.54, respectively, using the following assumptions: 
Weighted Average Black-Scholes Assumptions
 
2014
 
2013
 
2012
Risk-free interest rate
 
1.5
%
 
0.9
%
 
0.9
%
Expected volatility
 
38.2
%
 
40.3
%
 
40.3
%
Expected dividend yield
 
1.8
%
 
1.8
%
 
2.9
%
Expected option life, in years
 
5

 
5

 
5

Summary of Stock Option Activity
The following table summarizes stock option activity during 2014:
In thousands, except per share data
 
Number
of Options
 
Weighted-
Average
Exercise Price
Outstanding at January 1
 
2,255

 
$
77.87

Granted
 
393

 
138.60

Exercised
 
(487
)
 
78.58

Canceled or expired
 
(46
)
 
94.35

Outstanding at December 31
 
2,115

 
$
88.62

Exercisable at December 31
 
1,236

 
$
70.87

Summary of Additional Information Related to Stock Options Outstanding
The table below summarizes additional information related to stock options outstanding at December 31, 2014:
Options in thousands / dollars in millions, except share data
 
Outstanding Net of
Expected Forfeitures
 
Options
Exercisable
Number of options
 
2,043

 
1,236

Weighted-average exercise price per share
 
$
87.11

 
$
70.87

Aggregate intrinsic value
 
$
218

 
$
152

Weighted-average remaining contractual term, in years
 
6

 
5

Summary of Stock Unity Activity
The following table summarizes stock unit activity during 2014:
Stock units in thousands, except per-share data
 
Number of
Stock Units
 
Weighted- Average
Grant Date Fair
Value
Non-vested, at January 1
 
1,202

 
$
82.40

Granted
 
245

 
133.31

Canceled
 
(37
)
 
82.62

Vested and transferred to unrestricted
 
(306
)
 
80.88

Non-vested, at December 31
 
1,104

 
$
90.34