Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) - PSEG Power [Member] $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) Counterparty
Derivative [Line Items]
Current Exposure	$ 228
Securities held as Collateral	22
Net exposure	206
Number of Counterparties greater than 10%	$ 2
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	$ 226
Securities held as Collateral	22
Net exposure	204
Number of Counterparties greater than 10%	2
Amount Of Net Credit Exposure Greater Than Ten Percent	100	[1]
External Credit Rating, Non Investment Grade [Member]
Derivative [Line Items]
Current Exposure	2
Securities held as Collateral	0
Amount Of Net Credit Exposure Greater Than Ten Percent	0
Non-Investment Grade [Member]
Derivative [Line Items]
Net exposure	2
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	$ 19

[1] Represents net exposure of $67 million with PSE&G and $33 million with a non-affiliated counterparty