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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