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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |
Federal income tax rate | 21.00% |  |
Regulatory Liabilities | $ 2,707 | $ 3,002 |
NJ tax surcharge percent for 2020 to 2021 extended to 2023 | 2.50% |  |
Tax Adjustment Credit | $ (205) | (272) | $ (30)
NJ tax surcharge percent for 2018 to 2019 | 1.50% |  |
Public Service Electric and Gas Company |  |  |
Income Taxes [Line Items] |  |  |
Regulatory Liabilities | $ 2,707 | 3,002 |
NOL Carryforwards | 29 |  |
Excess deferred income tax flowback | 286 |  |
Tax Adjustment Credit | (205) | (272) | $ (30)
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 | $ 255 |  |
Reduction in Deferred Tax Liabilities |  | 1,900 |
Regulatory Liabilities |  | $ 2,600 |

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