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, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Solar Loans	$ 151	$ 164
Current Portion of Solar Loans	(29)	(28)
Noncurrent Portion of Solar Loans	$ 122	136
Average loan repayment period	8 years
Solar Loan I
Concentration Risk [Line Items]
Solar Loans	$ 20
Solar Loan II
Concentration Risk [Line Items]
Solar Loans	69
Solar Loan III
Concentration Risk [Line Items]
Solar Loans	$ 62
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	$ 145	156
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	$ 6	$ 8
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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Amount, before allowance for credit loss, of financing receivable, classified as current.

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