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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2016
Stockholders' Equity Note [Abstract]  
Stock based compensation expense
Charged to general and administrative expenses, total share-based compensation expense was as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
(In millions)
Restricted stock and performance awards
$
7

 
$
6

 
$
20

 
$
13

Employee stock purchase plan and stock options
1

 
1

 
4

 
3

 
$
8

 
$
7

 
$
24

 
$
16
Restricted share activity
Restricted stock. Restricted and performance stock activity for the nine months ended September 30, 2016 is summarized below:
 
Shares
 
Weighted
Average
Grant Date
Fair Value
 
(In thousands)
 
 
Unvested balance as of December 31, 2015
1,035

 
$
46.68

Granted
517

 
63.94

Vested
(342
)
 
41.79

Forfeited
(19
)
 
52.01

Unvested balance as of September 30, 2016
1,191

 
55.50