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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Financial Information For Stock Options
The following table includes financial information for stock options for each of the years presented:
 
2017
 
2016
 
2015
 
(In Millions)
Compensation expense included in Entergy’s consolidated net income
$4.4
 
$4.4
 
$4.3
Tax benefit recognized in Entergy’s consolidated net income
$1.7
 
$1.7
 
$1.6
Compensation cost capitalized as part of fixed assets and inventory
$0.7
 
$0.7
 
$0.7
Schedule of Weighted Average Assumptions
The stock option weighted-average assumptions used in determining the fair values are as follows:
 
2017
 
2016
 
2015
Stock price volatility
18.39%
 
20.38%
 
23.62%
Expected term in years
7.35
 
7.25
 
7.06
Risk-free interest rate
2.31%
 
1.77%
 
1.59%
Dividend yield
4.75%
 
4.50%
 
4.50%
Dividend payment per share
$3.50
 
$3.42
 
$3.34
Schedule of Stock Option Activity
A summary of stock option activity for the year ended December 31, 2017 and changes during the year are presented below:
 
 
 
Number
of Options
 
Weighted-
Average
Exercise
Price
 
 
Aggregate
Intrinsic
Value
 
Weighted-
Average
Contractual Life
Options outstanding as of January 1, 2017
7,137,210

 
$84.91
 
 
 
 
Options granted
791,900

 
$70.53
 
 
 
 
Options exercised
(1,109,306
)
 
$72.74
 
 
 
 
Options forfeited/expired
(1,654,950
)
 
$91.36
 
 
 
 
Options outstanding as of December 31, 2017
5,164,854

 
$83.26
 
$—
 
4.18 years
Options exercisable as of December 31, 2017
4,027,902

 
$86.37
 
$—
 
2.94 years
Weighted-average grant-date fair value of options granted during 2017
$6.54
 
 
 
 
 
 
Schedule of Stock Options Outstanding
The following table summarizes information about stock options outstanding as of December 31, 2017:
 
 
 
Options Outstanding
 
Options Exercisable
Range of
 
As of
 
Weighted-Average Remaining Contractual Life-Yrs.
 
Weighted Average Exercise Price
 
Number Exercisable as of
 
Weighted Average Exercise Price
Exercise Prices
 
12/31/2017
 
 
 
12/31/2017
 

$51
 -
$64.99
 
502,709

 
5.73
 
$63.68
 
502,709

 
$63.68

$65
 -
$78.99
 
2,790,045

 
5.56
 
$72.94
 
1,751,402

 
$74.36

$79
 -
$91.99
 
441,000

 
7.08
 
$89.90
 
342,691

 
$89.90

$92
 -
$108.20
 
1,431,100

 
0.06
 
$108.20
 
1,431,100

 
$108.20

$51
 -
$108.20
 
5,164,854

 
4.18
 
$83.26
 
4,027,902

 
$86.37
Restricted Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Financial Information For Stock Options
The following table includes financial information for restricted stock for each of the years presented:
 
2017
 
2016
 
2015
 
(In Millions)
Compensation expense included in Entergy’s consolidated net income
$19.7
 
$19.8
 
$19.5
Tax benefit recognized in Entergy’s consolidated net income
$7.6
 
$7.6
 
$7.5
Compensation cost capitalized as part of fixed assets and inventory
$5.2
 
$4.5
 
$3.9
Schedule of Stock Options Outstanding
The following table includes information about the restricted stock awards outstanding as of December 31, 2017:
 
Shares
 
Weighted-Average Grant Date Fair Value Per Share
Outstanding shares at January 1, 2017
683,474

 
$74.80
Granted
410,787

 
$70.71
Vested
(330,816
)
 
$73.61
Forfeited
(53,834
)
 
$75.63
Outstanding shares at December 31, 2017
709,611

 
$72.92
Long-Term Incentive Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Financial Information For Stock Options
The following table includes financial information for the long-term performance units for each of the years presented:
 
2017
 
2016
 
2015
 
(In Millions)
Compensation expense included in Entergy’s consolidated net income
$10.8
 

$12.3

 

$11.8

Tax benefit recognized in Entergy’s consolidated net income
$4.2
 

$4.8

 

$4.5

Compensation cost capitalized as part of fixed assets and inventory
$3.0
 

$2.9

 

$2.3
Schedule of Stock Options Outstanding
The following table includes information about the long-term performance units outstanding at the target level as of December 31, 2017:
 
Shares
 
Weighted-Average Grant Date Fair Value Per Share
Outstanding shares at January 1, 2017
571,551

 
$82.02
Granted
258,808

 
$72.28
Vested
(86,964
)
 
$67.16
Forfeited
(209,244
)
 
$72.12
Outstanding shares at December 31, 2017
534,151

 
$83.60
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Financial Information For Stock Options
The following table includes financial information for restricted stock unit awards for each of the years presented:
 
2017
 
2016
 
2015
 
(In Millions)
Compensation expense included in Entergy’s consolidated net income
$2.5
 
$2.2
 
$0.9
Tax benefit recognized in Entergy’s consolidated net income
$1.0
 
$0.8
 
$0.4
Compensation cost capitalized as part of fixed assets and inventory
$0.6
 
$0.4
 
$0.3
Schedule of Stock Options Outstanding
The following table includes information about the restricted stock unit awards outstanding as of December 31, 2017:
 
Shares
 
Weighted-Average Grant Date Fair Value Per Share
Outstanding shares at January 1, 2017
181,650

 
$74.94
Granted
40,170

 
$79.10
Vested
(5,800
)
 
$73.22
Forfeited
(14,450
)
 
$79.69
Outstanding shares at December 31, 2017
201,570

 
$75.48