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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
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
Non-vested at December 31, 2019 | 717,239 |  |  | $ | 25.56 |
Granted | 271,718 |  |  | 38.05 |
Forfeited | (16,750) |  |  | 35.86 |
Vested | (452,693) |  |  | 20.73 |
Non-vested at December 31, 2020 | 519,514 |  |  | 35.87 |
Summary of Company's DSU awards and non-vested PSU Awards 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
Outstanding at December 31, 2019 | 331,223 |  |  | $ | 23.98 |
Granted | 58,861 |  |  | 35.59 |
Converted to Common Stock | (47,378) |  |  | 26.87 |
Outstanding at December 31, 2020 | 342,706 |  |  | 25.37 |
The following table summarizes the Company's non-vested PSU awards and changes during the year:
| Units |  | Weighted Average Grant-Date Fair Value per Unit
Non-vested at December 31, 2019 | 1,200,541 |  |  | $ | 26.65 |
Granted(a) | 928,215 |  |  | 23.75 |
Forfeited | (5,142) |  |  | 35.77 |
Vested(b) | (1,330,053) |  |  | 15.91 |
Non-vested at December 31, 2020(c) | 793,561 |  |  | 41.69 |
(a)The weighted average grant date fair value per unit includes RPSUs that were granted during 2020 with grant date fair value of $45.60. It also includes RPSUs with 2017 grant date fair value of $15.91 and MSUs with 2016 grant date fair value of $15.28, that due to vesting at 200%, were considered additional grants in 2020 (b)MSUs granted during 2016 and RPSUs granted during 2017 vested during 2020 at 200% (c)Non-vested units as of December 31, 2020 includes 4,260 MSUs which were vested as of March 1, 2021
Schedule of Assumptions used in Fair Value Model | Significant assumptions used in the fair value model with respect to the Company's PSUs are summarized below:
| 2020 | 2019 | 2018 |  | 2017 |  | 2016
| RPSUs | RPSUs | RPSUs |  | RPSUs |  | MSUs
Expected volatility | 30.15 | % | 40.72 | % | 47.52 | % |  | 43.96 | % |  | 34.33 | %
Expected term (in years) | 3 | 3 | 3 |  | 3 |  | 3
Risk free rate | 1.58 | % | 2.45 | % | 2.01 | % |  | 1.5 | % |  | 1.31 | %
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)
Outstanding at December 31, 2019 | 134,398 |  |  | $ | 25.31 |  |  | 1 |  | $ | 2 |
Expired | (9,083) |  |  | 37.44 |  |  |  |  |
Exercised | (48,268) |  |  | 23.33 |  |  |  |  |
Outstanding at December 31, 2020 | 77,047 |  |  | 25.13 |  |  | 0.5 |  | 1 |
Exercisable at December 31, 2020 | 77,047 |  |  | 25.13 |  |  | 0.5 |  | 1 |
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,
(In millions) | 2020 |  | 2019 |  | 2018
Total intrinsic value of options exercised | $ | 1 |  |  | $ | 2 |  |  | $ | 10 |
Cash received from options exercised | 1 |  |  | 3 |  |  | 24 |
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, 2020, for each of the types of awards issued under the LTIPs. Minimum tax withholdings of $27 million, $36 million, and $19 million for the years ended December 31, 2020, 2019, and 2018, respectively, are reflected as a reduction to additional paid-in capital on the Company's consolidated balance sheets.
|  |  |  |  |  |  | Non-vested Compensation Cost
(In millions, except weighted average data) | Compensation Expense |  | Unrecognized Total Cost |  | Weighted Average Recognition Period Remaining (In years)
| Year Ended December 31, |  | As of December 31,
Award | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2020
RSUs | $ | 9 |  |  | $ | 9 |  |  | $ | 12 |  |  | $ | 7 |  |  | 1.15
DSUs | 2 |  |  | 2 |  |  | 2 |  |  | — |  |  | 0.00
MSUs | — |  |  | — |  |  | 4 |  |  | — |  |  | 0.01
RPSUs | 10 |  |  | 10 |  |  | 7 |  |  | 10 |  |  | 0.95
PRSUs(a) | 6 |  |  | 11 |  |  | 16 |  |  | 6 |  |  | 1.24
Total | $ | 27 |  |  | $ | 32 |  |  | $ | 41 |  |  | $ | 23 |  |  |
Tax detriment recognized | $ | (9) |  |  | $ | (12) |  |  | $ | (4) |  |  |  |  |
(a)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

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