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Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |
Costs recognized in Operation and Maintenance Expense | $ 3,015 | $ 2,901 | $ 2,991
PSE&G [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Costs recognized in Operation and Maintenance Expense | 1,575 | 1,458 | 1,465
Power [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Costs recognized in Operation and Maintenance Expense | 999 | $ 1,046 | $ 1,139
Maximum [Member] | Sewaren 7 Claim [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | $ 93 |  |

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