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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-based compensation for the periods ended September 30 is as follows:
(in millions)
Three Months
 
Nine Months
 
2013
 
2012
 
2013
 
2012
Stock option expense
$
4

 
$
2

 
$
10

 
$
9

Restricted stock and unit awards expense
22

 
21

 
63

 
54

Total stock-based compensation expense 1
$
26

 
$
23

 
$
73

 
$
63