Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) - PSEG Power [Member] $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) Counterparty
Derivative [Line Items]
Current Exposure	$ 330
Securities held as Collateral	21
Net exposure	309
Number of Counterparties greater than 10%	$ 3
Number Of Active Counterparties On Credit Risk Derivatives | Counterparty	132
Investment Grade - External Rating [Member]
Derivative [Line Items]
Percentage Of Credit Exposure	99.00%
Investment Grade [Member]
Derivative [Line Items]
Current Exposure	$ 326
Securities held as Collateral	20
Net exposure	306
Number of Counterparties greater than 10%	3
Amount Of Net Credit Exposure Greater Than Ten Percent	176	[1]
External Credit Rating, Non Investment Grade [Member]
Derivative [Line Items]
Current Exposure	4
Securities held as Collateral	1
Amount Of Net Credit Exposure Greater Than Ten Percent	0
Non-Investment Grade [Member]
Derivative [Line Items]
Net exposure	3
Number of Counterparties greater than 10%	0
Cash [Member]
Derivative [Line Items]
Securities held as Collateral	3
Letter of Credit [Member]
Derivative [Line Items]
Securities held as Collateral	$ 18

[1] Represents net exposure of $90 million with PSE&G and non-affiliated counterparties of $86 million.