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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-based compensation for the periods ended June 30 is as follows:
(in millions)
Three Months
 
Six Months
 
2015
 
2014
 
2015
 
2014
Stock option expense
$
3

 
$
6

 
$
9

 
$
9

Restricted stock and unit awards expense
16

 
24

 
28

 
38

Total stock-based compensation expense 
$
19

 
$
30

 
$
37

 
$
47