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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Benefits |  |  |
Amounts recognized in balance sheet |  |  |
Other current liabilities | $ 0 | $ 0 |
Other non-current liabilities | 172 | 192 |
Amounts recognized in accumulated OCI |  |  |
Net loss/(gain) | 73 | 110 |
Prior service cost/(credit) | 0 | 1 |
Total/Net accumulated OCI | 73 | 111 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |
Net actuarial (gain)/loss | (31) | 74 |
Amortization of net actuarial loss | (6) | (3) |
Amortization of prior service cost | 0 | 0 |
Effect of settlement/curtailment | (1) | (14) |
Other changes in plan assets and benefit obligations recognized in other comprehensive income | (38) | 57 |
Net periodic benefit cost/(credit) | 21 | 18 | $ (27)
Net recognized in net periodic pension (credit)/cost and OCI | (17) | 75 |
Significant components of NRG's domestic pension plan |  |  |
Projected benefit obligation | 1,023 | 1,036 | 1,452
Accumulated benefit obligation | 1,015 | 1,022 |
Fair value of plan assets | 851 | 844 | 1,336
Other Postretirement Benefits Plan |  |  |
Amounts recognized in balance sheet |  |  |
Other current liabilities | 5 | 7 |
Other non-current liabilities | 70 | 77 |
Amounts recognized in accumulated OCI |  |  |
Net loss/(gain) | (14) | (7) |
Prior service cost/(credit) | (4) | (12) |
Total/Net accumulated OCI | (18) | (19) |
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |
Net actuarial (gain)/loss | (5) | (11) |
Amortization of net actuarial loss | (1) | (2) |
Amortization of prior service cost | 8 | 8 |
Effect of settlement/curtailment | (1) | 0 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income | 1 | (5) |
Net periodic benefit cost/(credit) | (3) | (4) | (6)
Net recognized in net periodic pension (credit)/cost and OCI | (2) | (9) |
Significant components of NRG's domestic pension plan |  |  |
Projected benefit obligation | 75 | 84 | 105
Fair value of plan assets | $ 0 | $ 0 | $ 0

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