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Pension and Other Postretirement Benefits (OPEB) (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Schedule of Components of Net Periodic Benefit Cost | The following table provides the components of net periodic benefit costs (credits) relating to all qualified and nonqualified pension and OPEB plans on an aggregate basis for PSEG, excluding Servco. Amounts shown do not reflect the impacts of capitalization, co-owner allocations and certain regulatory orders. Only the service cost component is eligible for capitalization, when applicable.
|  |  | Pension Benefits |  |  | OPEB |  |  | Pension Benefits |  |  | OPEB |  |
|  |  | Three Months Ended |  |  | Three Months Ended |  |  | Nine Months Ended |  |  | Nine Months Ended |  |
|  |  | September 30, |  |  | September 30, |  |  | September 30, |  |  | September 30, |  |
|  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |
|  |  | Millions |  |
| Components of Net Periodic Benefit Costs (Credits) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Service Cost (included in O&M Expense) |  | $ | 22 |  |  | $ | 24 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 66 |  |  | $ | 71 |  |  | $ | 1 |  |  | $ | 2 |  |
| Non-Service Components of Pension and OPEB Costs (Credits) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest Cost |  |  | 57 |  |  |  | 57 |  |  |  | 9 |  |  |  | 9 |  |  |  | 173 |  |  |  | 169 |  |  |  | 27 |  |  |  | 28 |  |
| Expected Return on Plan Assets |  |  | (77 | ) |  |  | (80 | ) |  |  | (8 | ) |  |  | (9 | ) |  |  | (231 | ) |  |  | (241 | ) |  |  | (25 | ) |  |  | (26 | ) |
| Amortization of Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Prior Service Costs |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2 |  |  |  | 1 |  |
| Actuarial Loss (Gain) |  |  | 16 |  |  |  | 17 |  |  |  | (1 | ) |  |  | — |  |  |  | 47 |  |  |  | 53 |  |  |  | (3 | ) |  |  | (1 | ) |
| Non-Service Components of Pension and OPEB Costs (Credits) |  |  | (4 | ) |  |  | (6 | ) |  |  | 1 |  |  |  | — |  |  |  | (11 | ) |  |  | (19 | ) |  |  | 1 |  |  |  | 2 |  |
| Total Net Periodic Benefit Costs (Credits) |  | $ | 18 |  |  | $ | 18 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 55 |  |  | $ | 52 |  |  | $ | 2 |  |  | $ | 4 |  |
Schedule of Pension and OPEB Costs | Pension and OPEB costs (credits) for PSE&G and PSEG Power & Other are detailed as follows:
|  |  | Pension Benefits |  |  | OPEB |  |  | Pension Benefits |  |  | OPEB |  |
|  |  | Three Months Ended |  |  | Three Months Ended |  |  | Nine Months Ended |  |  | Nine Months Ended |  |
|  |  | September 30, |  |  | September 30, |  |  | September 30, |  |  | September 30, |  |
|  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |
|  |  | Millions |  |
| PSE&G |  | $ | 11 |  |  | $ | 11 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | 35 |  |  | $ | 32 |  |  | $ | (3 | ) |  | $ | (1 | ) |
| PSEG Power & Other |  |  | 7 |  |  |  | 7 |  |  |  | 2 |  |  |  | 1 |  |  |  | 20 |  |  |  | 20 |  |  |  | 5 |  |  |  | 5 |  |
| Total Net Periodic Benefit Costs (Credits) |  | $ | 18 |  |  | $ | 18 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 55 |  |  | $ | 52 |  |  | $ | 2 |  |  | $ | 4 |  |

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