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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of the status of stock options is presented below (options in thousands, aggregate intrinsic value in millions):
 
 
Options

 
Weighted Average
Exercise Prices

 
Weighted Average
Remaining
Contractual Term
(in years)
 
Aggregate Intrinsic
Value

Balance at December 31, 2013
 
5,450

 
$
59.78

 
3.77
 
$
320

Exercised
 
(1,581
)
 
60.43

 
 
 
 
Cancelled
 
(1
)
 
78.43

 
 
 
 
Balance at December 31, 2014
 
3,868

 
$
59.51

 
3.26
 
$
351

Options exercisable at December 31, 2014
 
3,868

 
$
59.51

 
3.26
 
$
351