Financing Receivables (Outstanding Loans by Class of Customer) (Detail) - Public Service Electric and Gas Company [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Concentration Risk [Line Items]
Average Loan Repayment Period	8 years
Outstanding Loans by Class of Customer	$ 59	$ 63
Current Portion of Outstanding Loans	21	23
Noncurrent Portion of Outstanding Loans	$ 38	40
Average Loan Remaining Repayment Period	3 years
Commercial/Industrial [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 56	60
Residential [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	3	$ 3
Solar Loan I [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 4
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	$ 28
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	$ 27
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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