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Stock-Based Compensation (Tables) | 12 Months Ended
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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

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