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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Non cash earnings benefit from new tax legislation |  | $ 745 |
Federal income tax rate | 21.00% | 35.00% |
Provisional Deferred Tax Benefit | $ 3 | $ (755) | $ 0
Bonus depreciation for tax purposes | 50.00% |  |
Current ITC rate for qualified property | 30.00% |  |
Regulatory Liabilities | $ 3,221 | 2,948 |
Revenue impact of additional excess deferred taxes | 46 |  |
Deferred Tax Assets, interest disallowance | $ 54 |  |
NJ surcharge tax percent for 2018 to 2019 | 3.00% |  |
NJ tax surcharge percent for 2020 to 2021 | 2.00% |  |
NJ tax surcharge expense | $ 7 |  |
PSEG [Member] |  |  |
Income Taxes [Line Items] |  |  |
Federal income tax rate | 21.00% |  |
Energy Holdings [Member] |  |  |
Income Taxes [Line Items] |  |  |
Non cash earnings benefit from new tax legislation |  | 147 |
Provisional Deferred Tax Benefit |  | (149) |
PSE&G [Member] |  |  |
Income Taxes [Line Items] |  |  |
Provisional Deferred Tax Benefit | $ 0 | (10) | 0
Regulatory Liabilities | 3,221 | 2,948 |
NOL Carryforwards | 21 |  |
Power [Member] |  |  |
Income Taxes [Line Items] |  |  |
Non cash earnings benefit from new tax legislation |  | 588 |
Provisional Deferred Tax Benefit | (1) | (610) | $ 0
Deferred Tax Assets, interest disallowance | 8 |  |
NOL Carryforwards | 14 |  |
Excess Deferred Income Taxes [Member] | PSE&G [Member] |  |  |
Income Taxes [Line Items] |  |  |
Reduction in Deferred Tax Liabilities |  | 2,100 |
Regulatory Liabilities | 3,170 | $ 2,868 |
Additional Excess Deferred Taxes | $ 34 |  |

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