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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2020519,514 $35.87 
Granted479,415 39.00 
Forfeited(49,816)37.41 
Vested(279,161)34.18 
Non-vested at December 31, 2021669,952 38.69 
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, 2020342,706 $25.37 
Granted64,512 32.27 
Converted to Common Stock(23,090)30.92 
Outstanding at December 31, 2021384,128 26.11 
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, 2020793,561 $41.69 
Granted426,768 46.78 
Forfeited(93,031)47.21 
Vested(396,793)35.32 
Non-vested at December 31, 2021730,505 47.40 
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:
2021(a)
20202019
RPSUsRPSUsRPSUs
Expected volatility34.05 %30.15 %40.72 %
Expected term (in years)333
Risk free rate0.17 %1.58 %2.45 %
(a) Assumptions pertain to the main award granted in January 2021. Additional 60,815 RPSUs were granted in September 2021 with a risk free rate of 0.42% and expected volatility of 37.38%
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, 202077,047 $25.13 0.5$1 
Expired(4,800)29.08 
Exercised(54,377)26.44 
Outstanding at December 31, 202117,870 20.07 0.2— 
Exercisable at December 31, 202117,870 20.07 0.2— 
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)202120202019
Total intrinsic value of options exercised$1 $1 $2 
Cash received from options exercised1 1 3 
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, 2021, for each of the types of awards issued under the LTIPs. Minimum tax withholdings of $9 million, $27 million, and $36 million for the years ended December 31, 2021, 2020, and 2019, 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,
Award20212020201920212021
RSUs$9 $9 $9 $16 1.80
DSUs2 2 2 — 0.00
RPSUs9 10 10 15 1.19
PRSUs(a)
7 6 11 10 1.52
Total$27 $27 $32 $41  
Tax detriment/(benefit) recognized$2 $(9)$(12)  
(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