Other Income (Deductions) (Schedule Of Other Income (Deductions)) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Component of Other Income (Deductions) [Line Items]
NDT Fund Interest and Dividends		$ 13	$ 14
Allowance for Funds Used During Construction		21	13
Solar Loan Interest		4	4
Purchase of Tax Losses		(35)
Other		1	2
Other Income (Deductions)		4	33
Public Service Electric and Gas Company [Member]
Component of Other Income (Deductions) [Line Items]
NDT Fund Interest and Dividends		0	0
Allowance for Funds Used During Construction		21	13
Solar Loan Interest		4	4
Purchase of Tax Losses		0
Other		2	2
Other Income (Deductions)		27	19
PSEG Power [Member]
Component of Other Income (Deductions) [Line Items]
NDT Fund Interest and Dividends		13	14
Allowance for Funds Used During Construction		0	0
Solar Loan Interest		0	0
Purchase of Tax Losses		(35)
Other		(1)	(1)
Other Income (Deductions)		(23)	13
Other Entities [Member]
Component of Other Income (Deductions) [Line Items]
NDT Fund Interest and Dividends	[1]	0	0
Allowance for Funds Used During Construction	[1]	0	0
Solar Loan Interest	[1]	0	0
Purchase of Tax Losses	[1]	0
Other	[1]	0	1
Other Income (Deductions)	[1]	$ 0	$ 1

[1] Other consists of activity at PSEG (as parent company), Energy Holdings, Services, PSEG LI and intercompany eliminations.