Financing Receivables (Outstanding Loans by Class of Customer) (Detail) - Public Service Electric and Gas Company [Member] - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2023	Dec. 31, 2022
Concentration Risk [Line Items]
Average Loan Repayment Period	8 years
Outstanding Loans by Class of Customer	$ 77	$ 89
Current Portion of Outstanding Loans	26	27
Noncurrent Portion of Outstanding Loans	$ 51	62
Average Loan Remaining Repayment Period	3 years
Commercial/Industrial [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 74	85
Residential [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	3	$ 4
Solar Loan I [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 7
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	$ 36
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	$ 34
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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