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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |
Non cash earnings benefit from new tax legislation |  | $ 745 |  |
Federal income tax rate |  | 35.00% |  |
Provisional Deferred Tax Benefit |  | $ (755) | $ 0 | $ 0
Bonus depreciation for tax purposes |  | 50.00% |  |
Current ITC rate for qualified property |  | 30.00% |  |
Regulatory Liabilities |  | $ 2,948 | 118 |
PSEG [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Federal income tax rate |  | 35.00% |  |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes |  | 9.00% |  |
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] |  |  |  |
Federal income tax rate |  | 35.00% |  |
Provisional Deferred Tax Benefit |  | $ (10) | 0 | 0
Regulatory Liabilities |  | 2,948 | 118 |
Power [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Non cash earnings benefit from new tax legislation |  | 588 |  |
Provisional Deferred Tax Benefit |  | (610) | 0 | $ 0
Subsequent Event [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Federal income tax rate | 21.00% |  |  |
Subsequent Event [Member] | PSE&G [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Federal income tax rate | 21.00% |  |  |
Excess Deferred Income Taxes [Member] | PSE&G [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Reduction in Deferred Tax Liabilities |  | 2,100 |  |
Regulatory Liabilities |  | $ 2,868 | $ 0 |

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