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Financing Receivables (Schedule Of Credit Risk Profile Based On Payment Activity) (Detail) - Public Service Electric and Gas Company - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Concentration Risk [Line Items] |  |
Solar Loans | $ 164 | $ 173
Current Portion of Solar Loans | (28) | (24)
Noncurrent Portion of Solar Loans | 136 | 149
Commercial/Industrial [Member] |  |
Concentration Risk [Line Items] |  |
Solar Loans | 156 | 164
Residential [Member] |  |
Concentration Risk [Line Items] |  |
Solar Loans | $ 8 | $ 9

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