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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2012
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 Ended
 
Six Months Ended
 
2012
 
2011
 
2012
 
2011
Stock option expense
$
2

 
$
6

 
$
8

 
$
12

Restricted stock and unit awards expense
25

 
17

 
39

 
29

Total stock-based compensation expense
$
27

 
$
23

 
$
47

 
$
41