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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
Share-based Compensation [Abstract]  
Summary Of Changes in Restricted Stock And Restricted Stock Units
The following table summarizes the changes in the number of outstanding restricted stock units for the six months ended June 30, 2016 (shares in millions):
 
Restricted Stock Units
 
Weighted-    
Average Grant     
Date Fair Value    
Outstanding at December 31, 2015
2.9

 
$
34

Granted
2.5

 
55

Vested
(1.0
)
 
27

Forfeited
(0.1
)
 
36

Outstanding at June 30, 2016
4.3

 
$
47