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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Company's NQSO activity, and changes during the year
The following table summarizes the Company's NQSO activity and changes during the year:
 
Shares
 
Weighted Average
Exercise Price
 
Weighted Average Remaining Contractual Term (In years)
 
Aggregate Intrinsic Value
(In millions)
 
(In whole)
 
 
 
 
Outstanding at December 31, 2014
2,533,177

 
$
30.95

 
2
 
$
9

Forfeited
(59,617
)
 
35.28

 
 
 
 

Exercised
(401,647
)
 
23.23

 
 
 
 
Outstanding at December 31, 2015
2,071,913

 
32.27

 
3
 
—

Exercisable at December 31, 2015
2,071,913

 
32.27

 
3
 
—
Summary of weighted average grant date fair value of options granted, the total intrinsic value of options exercised, and the cash received from the exercises of options
The following table summarizes the total intrinsic value of options exercised and the cash received from the exercises of options:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(In millions, except for weighted average)
Total intrinsic value of options exercised
$
2

 
$
7

 
$
19

Cash received from options exercised
9

 
21

 
33
Summary of Company's non-vested RSU awards and changes during the year
The following table summarizes the Company's non-vested RSU awards and changes during the year:
 
Units
 
Weighted Average Grant-Date Fair Value per Unit
 
(In whole)
Non-vested at December 31, 2014
2,674,626

 
$
26.15

Granted
741,351

 
27.31

Forfeited
(266,802
)
 
27.98

Vested
(887,179
)
 
23.31

Non-vested at December 31, 2015
2,261,996

 
27.59
Summary of Company's non-vested MSU awards and changes during the year
The following table summarizes the Company's non-vested MSU awards and changes during the year:
 
Units
 
Weighted Average Grant-Date Fair Value per Unit
 
(In whole)
Non-vested at December 31, 2014
2,304,569

 
$
26.13

Granted
1,108,410

 
26.68

Vested
(1,230,410
)
 
21.86

Forfeited
(202,412
)
 
29.44

Non-vested at December 31, 2015
1,980,157

 
29.54
Summary of significant assumptions used in the fair value model with respect to the Company's MSUs
Significant assumptions used in the fair value model with respect to the Company's MSUs are summarized below:
 
2015
 
2014
Expected volatility
24.08%-25.20%
 
23.62%-27.43%
Expected term (in years)
1-3
 
3-4
Risk free rate
0.25%-1.07%
 
0.76%-1.21%
Summary of NRG's total compensation expense recognized and total non-vested compensation costs not yet recognized and the period over which this expense is expected to be recognized
The following table summarizes NRG's total compensation expense recognized for the years presented as well as total non-vested compensation costs not yet recognized and the period over which this expense is expected to be recognized as of December 31, 2015, for each of the five types of awards issued under the LTIPs. Minimum tax withholdings of $21 million, $16 million, and $13 million for the years ended December 31, 2015, 2014, and 2013, respectively, are reflected as a reduction to Additional Paid-in Capital on the Company's Consolidated Balance Sheet and are reflected as operating activities on the Company's Consolidated Statement of Cash Flows.
 
 
 
 
 
 
 
Non-vested Compensation Cost
 
Compensation Expense
 
Unrecognized
Total Cost
 
Weighted Average Recognition Period Remaining (In years)
 
Year Ended December 31
 
As of December 31
Award
2015
 
2014
 
2013
 
2015
 
2015
 
(In millions, except weighted average data)
NQSOs(a)
$
—

 
$
1

 
$
4

 
$
—

 
—

RSUs
23

 
20

 
18

 
26

 
1.79

DSUs
2

 
2

 
2

 
—

 
—

MSUs
16

 
19

 
14

 
12

 
1.44

PUs(a)
—

 
—

 
2

 
—

 
—

Total
$
41

 
$
42

 
$
40

 
$
38

 
 

Tax detriment recognized
$
(12
)
 
$
(8
)
 
$
(6
)
 
 

 
 


(a) All NQSOs and PUs granted under the Company's LTIP were fully vested as of December 31, 2015.
Deferred Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Company's outstanding DSU awards and changes during the year
The following table summarizes the Company's outstanding DSU awards and changes during the year:
 
Units
 
Weighted Average Grant-Date Fair Value per Unit
 
(In whole)
Outstanding at December 31, 2014
384,663

 
$
21.21

Granted
70,929

 
25.14

Converted to Common Stock
(28,014
)
 
24.78

Outstanding at December 31, 2015
427,578

 
21.88