Other Income (Deductions) (Schedule Of Other Income (Deductions)) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021		Mar. 31, 2020
Component of Other Income (Deductions) [Line Items]
NDT Fund Interest and Dividends		$ 13		$ 13
Allowance for Funds Used During Construction		23		21
Solar Loan Interest		3		4
Purchase of Tax Losses		(16)		(35)
Other		2		1
Other Income (Deductions)		25		4
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		23		21
Solar Loan Interest		3		4
Purchase of Tax Losses		0		0
Other		2		2
Other Income (Deductions)		28		27
PSEG Power [Member]
Component of Other Income (Deductions) [Line Items]
NDT Fund Interest and Dividends		13		13
Allowance for Funds Used During Construction		0		0
Solar Loan Interest		0		0
Purchase of Tax Losses		(16)		(35)
Other		(1)		(1)
Other Income (Deductions)		(4)		(23)
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		0	[1]	0
Other	[1]	1		0
Other Income (Deductions)	[1]	$ 1		$ 0

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