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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 | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Concentration Risk [Line Items] |  |
Solar Loans | $ 121 | $ 151
Current Portion of Solar Loans | (29) | (29)
Noncurrent Portion of Solar Loans | $ 92 | 122
Average loan repayment period | 8 years |
Solar Loan I |  |
Concentration Risk [Line Items] |  |
Solar Loans | $ 14 |
Solar Loan II |  |
Concentration Risk [Line Items] |  |
Solar Loans | 56 |
Solar Loan III |  |
Concentration Risk [Line Items] |  |
Solar Loans | $ 51 |
Minimum |  |
Concentration Risk [Line Items] |  |
Loan Receivable, term | 10 years |
Maximum [Member] |  |
Concentration Risk [Line Items] |  |
Loan Receivable, term | 15 years |
Commercial/Industrial [Member] |  |
Concentration Risk [Line Items] |  |
Solar Loans | $ 116 | 145
Commercial/Industrial [Member] | Solar Loan I |  |
Concentration Risk [Line Items] |  |
Loan Receivable, term | 15 years |
Commercial/Industrial [Member] | Solar Loan II |  |
Concentration Risk [Line Items] |  |
Loan Receivable, term | 15 years |
Commercial/Industrial [Member] | Solar Loan III |  |
Concentration Risk [Line Items] |  |
Loan Receivable, term | 10 years |
Residential [Member] |  |
Concentration Risk [Line Items] |  |
Solar Loans | $ 5 | $ 6
Residential [Member] | Solar Loan I |  |
Concentration Risk [Line Items] |  |
Loan Receivable, term | 10 years |
Residential [Member] | Solar Loan II |  |
Concentration Risk [Line Items] |  |
Loan Receivable, term | 10 years |
Residential [Member] | Solar Loan III |  |
Concentration Risk [Line Items] |  |
Loan Receivable, term | 10 years |

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