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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
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, 20231,210,840 $37.88 
Granted413,872 51.89 
Forfeited(49,082)39.43 
Vested(525,470)38.38 
Non-vested at December 31, 20241,050,160 42.95 
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, 2023443,287 $29.07 
Granted46,617 76.31 
Converted to Common Stock(112,784)30.73 
Outstanding at December 31, 2024377,120 33.91 
The following table summarizes the Company's non-vested RPSU awards and changes during the year:
UnitsWeighted Average Grant-Date Fair Value per Unit
Non-vested at December 31, 2023671,889 $46.27 
Granted380,370 62.48 
Forfeited(22,623)52.55 
Vested(316,685)49.50 
Non-vested at December 31, 2024712,951 53.10 
Schedule of Assumptions used in Fair Value Model Significant assumptions used in the fair value model with respect to the Company's RPSUs are summarized below:
202420232022
Expected volatility34.46 %41.35 %37.54 %
Expected term (in years)333
Risk free rate4.05 %4.18 %0.97 %
Summary of Non-vested RSUs Under Vivint LTIP
The following table summarizes the non-vested RSUs under the Vivint LTIP and changes during the year:
Rollover RSUsRSUs granted following the Acquisition
UnitsWeighted Average Grant Date Fair Value per UnitUnitsWeighted Average Grant Date Fair Value per Unit
Non-vested at December 31, 20232,984,901 $31.63 780,298 $35.24 
Granted following the Acquisition date— — 800,032 56.02 
Forfeited(194,314)31.63 (82,973)41.38 
Vested(1,440,844)31.63 (318,774)39.52 
Non-vested at December 31, 20241,349,743 31.63 1,178,583 47.19 
Summary of Non-vested PSUs Under Vivint LTIP The following table summarizes the Company's non-vested RPSUs under the Vivint LTIP and changes during the year:
UnitsWeighted Average Grant Date Fair Value per Unit
Non-vested at December 31, 2023102,837 $44.96 
Granted71,568 66.44 
Forfeited— — 
Vested— — 
Non-vested at December 31, 2024174,405 53.63 
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, 2024, for each of the types of awards issued under the LTIPs. Minimum tax withholdings of $50 million, $22 million, and $6 million for the years ended December 31, 2024, 2023, and 2022, 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,
Award20242023202220242024
RSUs under NRG LTIP$29 $20 $15 $17 1.52
RSUs under Vivint LTIP56 76 — 48 1.32
DSUs3 2 2 — 0.00
RPSUs under NRG LTIP11 3 11 15 1.17
RPSUs under Vivint LTIP3 2 — 5 1.55
PRSUs(a)
43 20 6 68 1.33
Total$145 $123 $34 $153  
Tax (benefit)/detriment recognized$(14)$2 $3   
(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