Financing Receivables (Schedule Of Credit Risk Profile Based On Payment Activity) (Detail) - Public Service Electric and Gas Company - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Solar Loans	$ 164	$ 173
Current Portion of Solar Loans	(28)	(24)
Noncurrent Portion of Solar Loans	136	149
Commercial/Industrial [Member]
Concentration Risk [Line Items]
Solar Loans	156	164
Residential [Member]
Concentration Risk [Line Items]
Solar Loans	$ 8	$ 9

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