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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2012
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 three months ended March 31, 2012 (shares in millions):
 
Shares
 
Weighted-Average Exercise Price
 
Exercisable
at Period
End
 
Aggregate    
Intrinsic    
Value    
Exercisable    
Outstanding at December 31, 2011
15.4

 
$
21

 
9.8

 
$
5.4

Exercised
(1.1
)
 
8

 
 
 
 
Forfeited / expired
(0.7
)
 
23

 
 
 
 
Outstanding at March 31, 2012
13.6

 
$
22

 
10.9

 
$
15.6
Summary Of Changes in Restricted Stock And Restricted Stock Units
The following table summarizes the changes in the number of shares of restricted stock and restricted stock units for the three months ended March 31, 2012 (shares in millions):
 
Shares
 
Weighted-    
Average Grant     
Date Fair Value    
Outstanding at December 31, 2011
6.1

 
$
13

Granted
1.6

 
19

Vested
(1.9
)
 
9

Forfeited
(0.1
)
 
17

Outstanding at March 31, 2012
5.7

 
$
16