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Share-based Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2016
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 2016, 2015, and 2014 were $31.21, $63.40 and $42.09, respectively, using the following assumptions: 
Weighted Average Black-Scholes Assumptions
 
2016
 
2015
 
2014
Risk-free interest rate
 
1.2
%
 
1.5
%
 
1.5
%
Expected volatility
 
33.5
%
 
35.5
%
 
38.2
%
Expected dividend yield
 
2.8
%
 
1.4
%
 
1.8
%
Expected option life, in years
 
5

 
5

 
5
Summary of Stock Option Activity
The following table summarizes stock option activity during 2016:
In thousands, except per share data
 
Number
of Options
 
Weighted-
Average
Exercise Price
Outstanding at January 1
 
1,938

 
$
105.46

Granted
 
561

 
132.66

Exercised
 
(249
)
 
103.11

Canceled or expired
 
(35
)
 
144.40

Outstanding at December 31
 
2,215

 
$
112.00

Exercisable at December 31
 
1,401

 
$
90.30
Summary of Additional Information Related to Stock Options Outstanding
The table below summarizes additional information related to stock options outstanding at December 31, 2016:
Options in thousands / dollars in millions, except share data
 
Outstanding Net of
Expected Forfeitures
 
Options
Exercisable
Number of options
 
2,116

 
1,401

Weighted-average exercise price per share
 
$
111.93

 
$
90.30

Aggregate intrinsic value
 
$
156

 
$
131

Weighted-average remaining contractual term, in years
 
6

 
5
Summary of Stock Unity Activity
The following table summarizes stock unit activity during 2016:
Stock units in thousands, except per-share data
 
Number of
Stock Units
 
Weighted- Average
Grant Date Fair
Value
Non-vested, at January 1
 
833

 
$
125.71

Granted
 
314

 
127.88

Canceled
 
(20
)
 
151.50

Vested and transferred to unrestricted
 
(312
)
 
106.41

Non-vested, at December 31
 
815

 
$
134.21