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Pension And OPEB (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | $ 17 | $ 20 | $ 34 | $ 40
Pension Plan [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | 10 | 14 | 21 | 27
Postretirement Healthcare Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | 2 | (10) | 3 | (21)
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | 5 |  | 5 |
Postretirement Healthcare Plans [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | (1) | (10) | (1) | (20)
Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | 25 |  | 25 |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | 7 | 4 | 13 | 9
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Postretirement Healthcare Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | $ 4 | $ 3 | $ 7 | $ 6

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