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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits      
Amounts recognized in balance sheet      
Other current liabilities $ 0 $ 0  
Other non-current liabilities 192 116  
Amounts recognized in accumulated OCI      
Net loss/(gain) 110 52  
Prior service cost/(credit) 1 2  
Total/Net accumulated OCI 111 54  
Other changes in plan assets and benefit obligations recognized in other comprehensive income      
Net actuarial loss/(gain) 74 (72)  
Amortization of net actuarial loss (3) (1)  
Amortization of prior service cost 0 0  
Effect of settlement/curtailment (14) (2)  
Other changes in plan assets and benefit obligations recognized in other comprehensive income 57 (75)  
Net periodic benefit cost/(credit) 18 (27) $ (8)
Net recognized in net periodic pension cost/(credit) and OCI 75 (102)  
Significant components of NRG's domestic pension plan      
Projected benefit obligation 1,036 1,452 1,489
Accumulated benefit obligation 1,022 1,423  
Fair value of plan assets 844 1,336 1,272
Other Postretirement Benefits Plan      
Amounts recognized in balance sheet      
Other current liabilities 7 7  
Other non-current liabilities 77 98  
Amounts recognized in accumulated OCI      
Net loss/(gain) (7) 5  
Prior service cost/(credit) (12) (19)  
Total/Net accumulated OCI (19) (14)  
Other changes in plan assets and benefit obligations recognized in other comprehensive income      
Net actuarial loss/(gain) (11) 0  
Amortization of net actuarial loss (2) (1)  
Amortization of prior service cost 8 10  
Effect of settlement/curtailment 0 0  
Other changes in plan assets and benefit obligations recognized in other comprehensive income (5) 9  
Net periodic benefit cost/(credit) (4) (6) (10)
Net recognized in net periodic pension cost/(credit) and OCI (9) 3  
Significant components of NRG's domestic pension plan      
Projected benefit obligation 84 105 90
Fair value of plan assets $ 0 $ 0 $ 0