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Benefit Plans and Other Postretirement Benefits - Amounts Recognized in the Balance Sheets and OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Amounts recognized in balance sheet      
Other current liabilities $ 0 $ 0  
Other non-current liabilities 134 172  
Amounts recognized in accumulated OCI      
Net loss/(gain) 73 73  
Prior service cost/(credit) 0 0  
Total/Net accumulated OCI 73 73  
Other changes in plan assets and benefit obligations recognized in other comprehensive income      
Net actuarial (gain)/loss (4) (31)  
Amortization of net actuarial loss (2) (6)  
Settlement (gain)/loss 6 0  
Amortization of prior service cost 0 0  
Effect of settlement/curtailment 0 (1)  
Total recognized in OCI 0 (38)  
Net periodic benefit cost/(credit) 0 21 $ 18
Net recognized in net periodic pension (credit)/cost and OCI 0 (17)  
Significant components of NRG's domestic pension plan      
Projected benefit obligation 901 1,023 1,036
Accumulated benefit obligation 895 1,015  
Fair value of plan assets 767 851 844
Other Postretirement Benefits Plan      
Amounts recognized in balance sheet      
Other current liabilities 5 5  
Other non-current liabilities 65 70  
Amounts recognized in accumulated OCI      
Net loss/(gain) (14) (14)  
Prior service cost/(credit) (1) (4)  
Total/Net accumulated OCI (15) (18)  
Other changes in plan assets and benefit obligations recognized in other comprehensive income      
Net actuarial (gain)/loss (1) (5)  
Amortization of net actuarial loss 1 (1)  
Settlement (gain)/loss 0 0  
Amortization of prior service cost 3 8  
Effect of settlement/curtailment 0 (1)  
Total recognized in OCI 3 1  
Net periodic benefit cost/(credit) (1) (3) (4)
Net recognized in net periodic pension (credit)/cost and OCI 2 (2)  
Significant components of NRG's domestic pension plan      
Projected benefit obligation 70 75 84
Fair value of plan assets $ 0 $ 0 $ 0