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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
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, 20181,458,082  $16.16  
Granted266,938  37.37  
Forfeited(73,905) 24.73  
Vested(933,876) 14.20  
Non-vested at December 31, 2019717,239  25.56  
Summary of Company's Non-vested DSU awards and 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, 2018331,915  $22.94  
Granted57,630  34.84  
Converted to Common Stock(58,322) 28.93  
Outstanding at December 31, 2019331,223  23.98  
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, 20181,710,634  $19.12  
Granted(a)
936,889  22.50  
Forfeited(37,526) 23.04  
Vested(b)
(1,409,456) 14.72  
Non-vested at December 31, 2019(c)
1,200,541  26.65  
(a) The weighted average grant date fair value per unit includes RPSUs that were granted during 2019 with grant date fair value of $45.77 and MSUs with 2016 grant date fair value of $14.72, that due to vesting at 200%, were considered additional grants in 2019
(b) MSUs granted during 2016 vested during 2019 at 200%
(c) Non-vested units includes 8,645 MSUs
Summary of Company's PSU awards and 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, 2018331,915  $22.94  
Granted57,630  34.84  
Converted to Common Stock(58,322) 28.93  
Outstanding at December 31, 2019331,223  23.98  
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, 20181,710,634  $19.12  
Granted(a)
936,889  22.50  
Forfeited(37,526) 23.04  
Vested(b)
(1,409,456) 14.72  
Non-vested at December 31, 2019(c)
1,200,541  26.65  
(a) The weighted average grant date fair value per unit includes RPSUs that were granted during 2019 with grant date fair value of $45.77 and MSUs with 2016 grant date fair value of $14.72, that due to vesting at 200%, were considered additional grants in 2019
(b) MSUs granted during 2016 vested during 2019 at 200%
(c) Non-vested units includes 8,645 MSUs
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:
2019201820172016
RPSUsRPSUsRPSUsMSUs
Expected volatility40.72 %47.52 %43.96 %34.33 %
Expected term (in years)3333
Risk free rate2.45 %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, 2018279,934  $25.04  2$4  
Expired(8,254) 26.76  
Exercised(137,282) 24.67  
Outstanding at December 31, 2019134,398  25.31  12  
Exercisable at December 31, 2019134,398  25.31  12  
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)201920182017
Total intrinsic value of options exercised$2  $10  $1  
Cash received from options exercised3  24  4  
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, 2019, for each of the types of awards issued under the LTIPs. Minimum tax withholdings of $36 million, $19 million, and $5 million for the years ended December 31, 2019, 2018, and 2017, 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,
Award20192018201720192019
RSUs9  12  15  8  1.06
DSUs2  2  2  —  0.00
MSUs—  4  5  —  0.50
RPSUs10  7  3  9  0.71
PRSUs(a)
11  16  13  10  1.05
Total(b)
$32  $41  $38  $27     
Tax detriment recognized$(12) $(4) $(5)   
(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
(b) Does not include compensation expense of $1 million, and $6 million for the years ended 2018, and 2017, respectively, which was recorded in loss from discontinued operations in the Company's consolidated statements of operations