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Pension And OPEB (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension Lift Out Settlement Charge | $ 332 |  | $ 332 |
Pension Lift Out Settlement Charge, net of tax | 239 |  | 239 |
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | 349 | $ (28) | 389 | $ (86)
Pension Lift Out Settlement Charge | 332 | 0 | 332 | 0
Pension Plan [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | 10 | (18) | 37 | (53)
Postretirement Healthcare Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | (11) | (31) | (32) | (93)
Pension Lift Out Settlement Charge | 0 | 0 | 0 | 0
Postretirement Healthcare Plans [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | (11) | (27) | (31) | (82)
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | 9 | 15 | 18 | 30
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Postretirement Healthcare Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | $ 3 | $ 2 | $ 9 | $ 7

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