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Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) - USD ($) $ in Millions | Jan. 31, 2021 | Dec. 31, 2020
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Maximum [Member] | LIPA complaint |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss |  | $ 70.0
Maximum [Member] | PSEG Power LLC | Sewaren 7 Claim [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss |  | 93.0
Maximum [Member] | PSEG Power LLC | Sewaren 7 Claim [Member] | Subsequent Event [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 68.0 |
Minimum | LIPA complaint |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss |  | $ 6.5

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