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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
In millions
2015
 
2014
 
2015
 
2014
Stock-based compensation:
 
 
 
 
 
 
 
Stock options
$
19

 
$
24

 
$
45

 
$
50

Restricted stock units
25

 
18

 
43

 
27

Total stock-based compensation
$
44

 
$
42

 
$
88

 
$
77