Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) - PSEG Power [Member] $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) Counterparty
Derivative [Line Items]
Current Exposure	$ 492
Securities held as Collateral	93
Net exposure	399
Number of Counterparties greater than 10%	$ 3
Number Of Active Counterparties On Credit Risk Derivatives | Counterparty	141
Investment Grade - External Rating [Member]
Derivative [Line Items]
Percentage Of Credit Exposure	99.00%
Investment Grade [Member]
Derivative [Line Items]
Current Exposure	$ 488
Securities held as Collateral	93
Net exposure	395
Number of Counterparties greater than 10%	3
Amount Of Net Credit Exposure Greater Than Ten Percent	235	[1]
External Credit Rating, Non Investment Grade [Member]
Derivative [Line Items]
Current Exposure	4
Securities held as Collateral	0
Amount Of Net Credit Exposure Greater Than Ten Percent	0
Non-Investment Grade [Member]
Derivative [Line Items]
Net exposure	4
Number of Counterparties greater than 10%	0
Cash [Member]
Derivative [Line Items]
Securities held as Collateral	6
Letter of Credit [Member]
Derivative [Line Items]
Securities held as Collateral	87
Other Entities [Member] | Investment Grade [Member]
Derivative [Line Items]
Amount Of Net Credit Exposure Greater Than Ten Percent	98
Public Service Electric and Gas Company [Member] | Investment Grade [Member]
Derivative [Line Items]
Amount Of Net Credit Exposure Greater Than Ten Percent	$ 137

[1] Represents net exposure of $137 million with PSE&G and $98 million with two non-affiliated counterpart