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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2013
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, 2013 (in millions, except per share value):
 
Shares
 
Weighted-Average Exercise Price
 
Exercisable
at Period
End
 
Aggregate    
Intrinsic    
Value    
Exercisable    
Outstanding at December 31, 2012
11.1

 
$
22

 
9.0

 
$
27.8

Exercised
(3.2
)
 
20

 
 
 
 
Forfeited / expired
(1.1
)
 
29

 
 
 
 
Outstanding at September 30, 2013
6.8

 
$
22

 
6.2

 
$
35.4
Summary Of Changes in Restricted Stock And Restricted Stock Units
The following table summarizes the changes in the number of restricted stock units for the nine months ended September 30, 2013 (shares in millions):
 
Restricted Stock Units
 
Weighted-    
Average Grant     
Date Fair Value    
Outstanding at December 31, 2012
5.5

 
$
17

Granted
2.2

 
25

Vested
(2.5
)
 
15

Forfeited
(0.8
)
 
21

Outstanding at September 30, 2013
4.4

 
$
22