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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2011
Share-based Compensation [Abstract] 
Summary Of Changes In Stock Options
The following table summarizes the changes in the number of shares of common stock under option for the nine months ended September 30, 2011 (shares in millions):
 
Shares
 
Weighted Average Exercise Price
 
Exercisable
at Period
End
 
Aggregate    
Intrinsic    
Value    
Exercisable    
Outstanding at December 31, 2010
16.3

 
$
22

 
8.9

 
$
1.5

Granted
1.0

 
19

 
 
 
 
Forfeited / expired
(1.3
)
 
23

 
 
 
 
Outstanding at September 30, 2011
16.0

 
$
21

 
10.2

 
$
2.2

Summary Of Changes Of Restricted Stock And Restricted Stock Units
 
Shares
 
Weighted Average Exercise Price
 
Exercisable
at Period
End
 
Aggregate    
Intrinsic    
Value    
Exercisable    
Outstanding at December 31, 2010
16.3

 
$
22

 
8.9

 
$
1.5

Granted
1.0

 
19

 
 
 
 
Forfeited / expired
(1.3
)
 
23

 
 
 
 
Outstanding at September 30, 2011
16.0

 
$
21

 
10.2

 
$
2.2


The following table summarizes the changes in the number of shares of restricted stock and restricted stock units for the nine months ended September 30, 2011 (shares in millions):