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Stock-Based Compensation (Tables)
 12 Months Ended
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:
UnitsWeighted Average Grant Date Fair Value per Unit
Non-vested at December 31, 2019717,239 $25.56 
Granted271,718 38.05 
Forfeited(16,750)35.86 
Vested(452,693)20.73 
Non-vested at December 31, 2020519,514 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:
UnitsWeighted Average Grant Date Fair Value per Unit
Outstanding at December 31, 2019331,223 $23.98 
Granted58,861 35.59 
Converted to Common Stock(47,378)26.87 
Outstanding at December 31, 2020342,706 25.37 
The following table summarizes the Company's non-vested PSU awards and changes during the year:
UnitsWeighted Average Grant-Date Fair Value per Unit
Non-vested at December 31, 20191,200,541 $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:
20202019201820172016
RPSUsRPSUsRPSUsRPSUsMSUs
Expected volatility30.15 %40.72 %47.52 %43.96 %34.33 %
Expected term (in years)33333
Risk free rate1.58 %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, 2019134,398 $25.31 1$2 
Expired(9,083)37.44 
Exercised(48,268)23.33 
Outstanding at December 31, 202077,047 25.13 0.51 
Exercisable at December 31, 202077,047 25.13 0.51 
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)202020192018
Total intrinsic value of options exercised$1 $2 $10 
Cash received from options exercised1 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,
Award20202019201820202020
RSUs$9 $9 $12 $7 1.15
DSUs2 2 2 — 0.00
MSUs— — 4 — 0.01
RPSUs10 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