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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes [Line Items] |  |  |
Federal income tax rate | 21.00% |  |
Regulatory Liabilities | $ 2,075 | $ 2,240 |
NOL Carryforwards | 33 |  |
Tax Adjustment Credit | (232) | (193) | $ (171)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 10 | 28 | 0
Public Service Electric and Gas Company |  |  |
Income Taxes [Line Items] |  |  |
Regulatory Liabilities | 2,075 | 2,240 |
NOL Carryforwards | 71 |  |
Excess deferred income tax flowback | 323 |  |
Tax Adjustment Credit | (232) | (193) | (171)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 7 | $ 0 | $ 0
Excess Deferred Income Taxes excluding amounts from previously realized repair deductions [Member] | Public Service Electric and Gas Company |  |  |
Income Taxes [Line Items] |  |  |
Reduction in Regulatory Liability | 243 |  |
Reduction in Deferred Tax Liabilities | 1,300 |  |
Regulatory Liabilities | $ 1,800 |  |

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