Financing Receivables (Outstanding Loans by Class of Customer) (Detail) - Public Service Electric and Gas Company [Member] - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 161	$ 173
Current Portion of Outstanding Loans	24	24
Noncurrent Portion of Outstanding Loans	137	149
Commercial/Industrial [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	153	164
Residential [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 8	$ 9

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