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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Stock based compensation expense
Total share-based compensation expense was as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In millions)
 
Pretax
Charges
 
Net-of-Tax
Amount
 
Pretax
Charges
 
Net-of-Tax
Amount
 
Pretax
Charges
 
Net-of-Tax
Amount
RSAs, PSAs and PSUs
$
17

 
$
17

 
$
39

 
$
35

 
$
20

 
$
17

Employee stock purchase plan and stock options
10

 
9

 
7

 
5

 
6

 
5

 
$
27

 
$
26

 
$
46

 
$
40

 
$
26

 
$
22

Restricted and performance stock activity
ctivity for such awards in the year ended December 31, 2018 is summarized below:
 
RSAs
 
PSAs
 
PSUs
 
Total Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested balance as of December 31, 2017
401,804

 
84,762

 
91,828

 
578,394

 
$
58.35

Granted
363,740

 

 
214,952

 
578,692

 
75.38

Vested
(192,609
)
 
(32,929
)
 

 
(225,538
)
 
59.08

Forfeited
(173,140
)
 
(48,701
)
 
(105,397
)
 
(327,238
)
 
63.69

Unvested balance as of December 31, 2018
399,795

 
3,132

 
201,383

 
604,310

 
$
71.50

Stock Options, Activity
The total grant date fair value of awards granted and vested is presented in the following table:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In millions)
Granted:
 
 
 
 
 
RSAs
$
28

 
$
20

 
$
19

PSAs

 

 
15

PSUs
16

 
16

 

 
$
44

 
$
36

 
$
34

Vested:
 
 
 
 
 
RSAs
$
15

 
$
23

 
$
22

PSAs
3

 
15

 

PSUs

 
9

 

 
$
18

 
$
47

 
$
22

Stock Options. Stock option awards generally have an exercise price equal to the fair market value of our common stock on the date of grant, vest in equal annual installments over periods up to four years from the date of grant, and have a maximum term of ten years from the date of grant. Stock option activity for the year ended December 31, 2018 is summarized below:
 
Shares
 
Weighted Average Exercise Price
 
Aggregate Intrinsic Value
 
Weighted Average Remaining Contractual term
 
 
 
 
 
(In millions)
 
(Years)
Stock options outstanding as of December 31, 2017
405,000

 
$
64.79

 
 
 
 
Granted

 

 
 
 
 
Exercised

 

 
 
 
 
Stock options outstanding as of December 31, 2018
405,000

 
64.79

 
$
21

 
8.5
Stock options exercisable and expected to vest as of December 31, 2018
405,000

 
64.79

 
$
21

 
8.5
Exercisable as of December 31, 2018
155,000

 
60.69

 
$
9

 
8.0
Stock Option Plans, by Exercise Price Range
The following is a summary of information about stock options outstanding and exercisable at December 31, 2018:
 
Options Outstanding
 
Options Exercisable
 
Number Outstanding
 
Weighted Average Remaining Contractual Life (Years)
 
Weighted-Average Exercise Price
 
Number Exercisable
 
Weighted-Average Exercise Price
Range of Exercise Prices
 
 
 
 
 
 
 
 
 
$33.02
30,000

 
4.2
 
$
33.02

 
30,000

 
$
33.02

$67.33
375,000

 
8.9
 
67.33

 
125,000

 
67.33

 
405,000

 
 
 
 
 
155,000