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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock option awards activity
The following table summarizes activity involving stock option awards for the year ended December 31, 2017:
 
Number of
Options
 
Weighted-
Average
Exercise
Price
 
(in thousands)
 
 
Outstanding and Exercisable at December 31, 2016
3,008

 
$
40.08

Exercised
(12
)
 
10.75

Forfeited/Expired
(1,974
)
 
46.82

Outstanding and Exercisable at December 31, 2017
1,022

 
27.41
Restricted stock and restricted stock unit awards activity
The following table summarizes activity involving restricted stock and restricted stock unit awards for the year ended December 31, 2017:
 
Number of
Shares
 
Weighted-
Average
Grant Date
Fair Value
 
(in thousands)
 
 
Non-vested at December 31, 2016
5,948

 
$
31.89

Level 3 replacement awards
12,530

 
18.99

Granted (1)
5,223

 
22.02

Vested
(2,762
)
 
28.55

Forfeited
(1,165
)
 
26.43

Non-vested at December 31, 2017
19,774

 
21.90

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(1) Shares granted whose related performance conditions were not finalized at December, 31, 2017, were excluded from this figure.
During 2016, we granted 3.6 million shares of restricted stock and restricted stock unit awards at a weighted-average price of $30.83. During 2015, we granted 2.9 million shares of restricted stock and restricted stock unit awards at a weighted-average price of $31.83. The total fair value of restricted stock that vested during 2017, 2016 and 2015, was $60 million, $47 million and $59 million, respectively.