Pension and Other Postretirement Benefits (OPEB) - Schedule of Pension and OPEB Costs (Detail) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Pension Benefits [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Total Net Benefit (Credits) Costs | $ 18 | $ 17 |
| Pension Benefits [Member] | Public Service Electric and Gas Company [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Total Net Benefit (Credits) Costs | 12 | 11 |
| Pension Benefits [Member] | PSEG Power & Other | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Total Net Benefit (Credits) Costs | 6 | 6 |
| OPEB [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Total Net Benefit (Credits) Costs | 1 | 1 |
| OPEB [Member] | Public Service Electric and Gas Company [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Total Net Benefit (Credits) Costs | (1) | 0 |
| OPEB [Member] | PSEG Power & Other | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Total Net Benefit (Credits) Costs | $ 2 | $ 1 |