Financing Receivables (Outstanding Loans by Class of Customer) (Detail) - Public Service Electric and Gas Company [Member] - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Average Loan Repayment Period	8 years
Outstanding Loans by Class of Customer	$ 127	$ 151
Current Portion of Outstanding Loans	30	29
Noncurrent Portion of Outstanding Loans	$ 97	122
Average Loan Remaining Repayment Period	4 years
Commercial/Industrial [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 122	145
Residential [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	5	$ 6
Solar Loan I [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 16
Solar Loan I [Member] \| Commercial/Industrial [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	15 years
Solar Loan I [Member] \| Residential [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	10 years
Solar Loan II [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 58
Solar Loan II [Member] \| Commercial/Industrial [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	15 years
Solar Loan II [Member] \| Residential [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	10 years
Solar Loan III [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 53
Solar Loan III [Member] \| Commercial/Industrial [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	10 years
Solar Loan III [Member] \| Residential [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	10 years
Minimum [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	10 years
Maximum [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	15 years

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