Financing Receivables (Outstanding Loans by Class of Customer) (Detail) - Public Service Electric and Gas Company [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Average Loan Repayment Period	7 years
Outstanding Loans by Class of Customer	$ 162	$ 164
Current Portion of Outstanding Loans	26	28
Noncurrent Portion of Outstanding Loans	$ 136	136
Average Loan Remaining Repayment Period	4 years
Commercial/Industrial [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 154	156
Residential [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	8	$ 8
Solar Loan I [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 26
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	$ 82
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	$ 54
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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