Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) - PSEG Power [Member] $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) Counterparty
Derivative [Line Items]
Current Exposure	$ 81
Securities held as Collateral	16
Net exposure	65
Number of Counterparties greater than 10%	$ 3
Number Of Active Counterparties On Credit Risk Derivatives | Counterparty	127
Investment Grade - External Rating [Member]
Derivative [Line Items]
Percentage Of Credit Exposure	99.00%
Investment Grade [Member]
Derivative [Line Items]
Current Exposure	$ 79
Securities held as Collateral	15
Net exposure	64
Number of Counterparties greater than 10%	3
Amount Of Net Credit Exposure Greater Than Ten Percent	41
External Credit Rating, Non Investment Grade [Member]
Derivative [Line Items]
Current Exposure	2
Securities held as Collateral	1
Amount Of Net Credit Exposure Greater Than Ten Percent	0
Non-Investment Grade [Member]
Derivative [Line Items]
Net exposure	1
Number of Counterparties greater than 10%	0
Letter of Credit [Member]
Derivative [Line Items]
Securities held as Collateral	16
Public Service Electric and Gas Company [Member] | Investment Grade [Member]
Derivative [Line Items]
Amount Of Net Credit Exposure Greater Than Ten Percent	21
Non affiliated counterparties | Investment Grade [Member]
Derivative [Line Items]
Amount Of Net Credit Exposure Greater Than Ten Percent	$ 20