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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

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