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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Stock based compensation expense
Charged to general and administrative expenses, total share-based compensation expense was as follows:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(In millions)
 
Pretax
Charges
 
Net-of-Tax
Amount
 
Pretax
Charges
 
Net-of-Tax
Amount
 
Pretax
Charges
 
Net-of-Tax
Amount
Restricted stock and performance awards
$
20

 
$
17

 
$
19

 
$
13

 
$
19

 
$
12

Employee stock purchase plan and stock options
6

 
5

 
4

 
3

 
3

 
2

 
$
26

 
$
22

 
$
23

 
$
16

 
$
22

 
$
14
Restricted and performance stock activity
Restricted stock. Restricted and performance stock activity for the year ended December 31, 2016 is summarized below:
 
Restricted Shares
 
Performance Shares
 
Total Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested balance as of December 31, 2015
658,156

 
376,601

 
1,034,757

 
$
46.68

Granted
300,007

 
226,010

 
526,017

 
63.84

Vested
(352,292
)
 
—

 
(352,292
)
 
42.06

Canceled
—

 
(256,955
)
 
(256,955
)
 
46.24

Forfeited
(28,627
)
 
—

 
(28,627
)
 
53.06

Unvested balance as of December 31, 2016
577,244

 
345,656

 
922,900

 
$
58.15