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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
 
Three Months Ended
 September 30,
 
Nine Months Ended
September 30,
In millions
2015
 
2014
 
2015
 
2014
Stock-based compensation:
 
 
 
 
 
 
 
Stock options
$
22

 
$
26

 
$
67

 
$
76

Restricted stock awards
65

 
18

 
108

 
45

Total stock-based compensation
$
87

 
$
44

 
$
175

 
$
121