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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation [Abstract]  
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(a)
 
Weighted Average
Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
 
 
 
(In years)
 
 (In millions)
Outstanding at December 31, 2017
1,285,858

 
$
25.49

 
3
 
$
6

Expired
(36,866
)
 
43.64

 
 
 
 
Exercised
(969,058
)
 
24.93

 
 
 
 
Outstanding at December 31, 2018
279,934

 
25.04

 
2
 
4

Exercisable at December 31, 2018
279,934

 
25.04

 
2
 
4


(a) As of December 31, 2018, 26,430 NQSOs granted to employees of GenOn remain outstanding and exercisable
Summary of 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,
 
2018
 
2017
 
2016
 
(In millions)
Total intrinsic value of options exercised
$
10

 
$
1

 
$
—

Cash received from options exercised
24

 
4

 
—
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(a)
 
Weighted Average Grant Date Fair Value per Unit
Non-vested at December 31, 2017
2,377,813

 
$
14.63

Granted
447,309

 
28.90

Forfeited
(315,569
)
 
18.93

Vested
(1,051,471
)
 
17.67

Non-vested at December 31, 2018
1,458,082

 
16.16

(a) As of December 31, 2018, 7,319 RSUs granted to GenOn employees remain outstanding
Summary of significant assumptions used in the fair value model with respect to the Company's MSUs
The following table summarizes the Company's outstanding DSU awards and changes during the year:
 
Units(a)
 
Weighted Average Grant Date Fair Value per Unit
Outstanding at December 31, 2017
427,148

 
$
21.54

Granted
61,645

 
33.43

Converted to Common Stock
(156,878
)
 
23.59

Outstanding at December 31, 2018
331,915

 
22.94
Summary of Company's outstanding DSU awards and changes during the year
The following table summarizes the Company's non-vested PSU awards and changes during the year:
 
Units(a)
 
Weighted Average Grant-Date Fair Value per Unit
Non-vested at December 31, 2017
1,858,821

 
$
18.27

Granted
372,147

 
35.36

Forfeited
(134,473
)
 
22.26

Vested
(385,861
)
 
30.31

Non-vested at December 31, 2018
1,710,634

 
19.12

(a) There were no PSUs granted to GenOn employees and outstanding as of December 31, 2018
Schedule of Share-based Payment Awards, Market Unit Valuation Assumptions
Significant assumptions used in the fair value model with respect to the Company's PSUs are summarized below:
 
2018
 
2017
 
2016
 
RPSUs
 
RPSUs
 
MSUs
Expected volatility
47.52
%
 
43.96
%
 
34.33
%
Expected term (in years)
3

 
3

 
3

Risk free rate
2.01
%
 
1.5
%
 
1.31
%
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, 2018, for each of the types of awards issued under the LTIPs. Minimum tax withholdings of $19 million, $5 million, and $5 million for the years ended December 31, 2018, 2017, and 2016, respectively, are reflected as a reduction to additional paid-in capital on the Company's consolidated balance sheets and are reflected as operating activities on the Company's consolidated statements 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
2018
 
2017
 
2016
 
2018
 
2018
 
(In millions, except weighted average data)
NQSOs(a)
$
—

 
$
—

 
$
—

 
$
—

 
0.00
RSUs
12

 
15

 
12

 
9

 
0.89
DSUs
2

 
2

 
2

 
—

 
0.00
MSUs
4

 
5

 
2

 
—

 
0.03
RPSUs
7

 
3

 
—

 
10

 
1.32
PRSUs(b)
16

 
13

 
4

 
14

 
1.17
Total(c)
$
41

 
$
38

 
$
20

 
$
33

 
 
Tax detriment recognized
$
(4
)
 
$
(5
)
 
$
(4
)
 
 

 
 

(a) All NQSOs granted under the Company's LTIP were fully vested as of December 31, 2018, 2017, and 2016
(b) Phantom Restricted Stock Units, PRSUs, are liability-classified time-based awards that typically vest ratably over a three-year period. The amount to be paid upon vesting is based on NRG's closing stock price for the period
(c) Does not include compensation expense of $1 million, $6 million, and $4 million for each of the years ended December 31, 2018, 2017, and 2016, which was recorded in loss from discontinued operations in the Company's consolidated statements of operations