Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) Counterparty
PSEG Power [Member]
Derivative [Line Items]
Current Exposure	$ 284
Securities held as Collateral	11
Net exposure	$ 273
Number of Counterparties greater than 10% | Counterparty	1
Number Of Active Counterparties On Credit Risk Derivatives | Counterparty	102
PSEG Power [Member] | Investment Grade - External Rating [Member]
Derivative [Line Items]
Percentage Of Credit Exposure	96.00%
PSEG Power [Member] | Investment Grade [Member]
Derivative [Line Items]
Current Exposure	$ 270
Securities held as Collateral	9
Net exposure	$ 261
Number of Counterparties greater than 10% | Counterparty	1
Amount Of Net Credit Exposure Greater Than Ten Percent	$ 148
PSEG Power [Member] | External Credit Rating, Non Investment Grade [Member]
Derivative [Line Items]
Current Exposure	14
Securities held as Collateral	2
Amount Of Net Credit Exposure Greater Than Ten Percent	0
PSEG Power [Member] | Non-Investment Grade [Member]
Derivative [Line Items]
Net exposure	$ 12
Number of Counterparties greater than 10% | Counterparty	0
Public Service Electric and Gas Company [Member]
Derivative [Line Items]
Current Exposure	$ 179
Letter of Credit [Member] | PSEG Power [Member]
Derivative [Line Items]
Securities held as Collateral	11
Public Service Electric and Gas Company [Member] | PSEG Power [Member] | Investment Grade [Member]
Derivative [Line Items]
Amount Of Net Credit Exposure Greater Than Ten Percent	$ 148