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Stock-Based Incentive Plan (Tables)
 6 Months Ended
Jun. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Activity
The following table summarizes stock option activity:
 
Number of Shares
Under Option
 
Weighted
Average
Exercise Price
per Share
Outstanding at December 31, 2011
23,599,256

 
$
17.42

Options granted
2,457,343

 
22.94

Options exercised
(1,978,618
)
 
13.99

Options forfeited
(369,908
)
 
19.68

Outstanding at June 30, 2012
23,708,073

 
$
18.24

Vested and expected to vest at June 30, 2012
22,629,289

 
$
18.12

Options exercisable at June 30, 2012
16,027,140

 
$
16.83
Status Of Company's Nonvested Restricted Stock And Restricted Stock Unit Awards And Changes
A summary of the status of the Company’s nonvested restricted stock and restricted stock unit awards, including performance based restricted stock, as of June 30, 2012 and the changes during the six months ended June 30, 2012 is presented below:
 
Number of
Restricted
Stock Awards
 
Weighted  Average
Grant-Date
Fair Value per  Share
Nonvested at December 31, 2011
2,520,487

 
$
20.16

Granted
926,512

 
23.28

Released
(788,398
)
 
16.18

Forfeited
(59,020
)
 
22.33

Nonvested at June 30, 2012
2,599,581

 
$
22.44

As