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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |
Federal income tax rate | 21.00% | 21.00% | 35.00%
Provisional Deferred Tax Benefit | $ 0 | $ 3 | $ (755)
Regulatory Liabilities | $ 3,002 | 3,221 |
NJ surcharge tax percent for 2018 to 2019 | 2.50% |  |
NJ tax surcharge percent for 2020 to 2021 | 1.50% |  |
Tax Adjustment Credit | $ (272) | (30) | 0
Public Service Electric and Gas Company |  |  |
Income Taxes [Line Items] |  |  |
Provisional Deferred Tax Benefit | 0 | 0 | (10)
Regulatory Liabilities | 3,002 | 3,221 |
NOL Carryforwards | 16 |  |
Excess deferred income tax flowback | 380 |  |
Tax Adjustment Credit | (272) | (30) | $ 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 | $ 321 |  |
Reduction in Deferred Tax Liabilities |  | 2,100 |
Regulatory Liabilities |  | $ 2,900 |

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