Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities in the NDT and Rabbi Trusts) (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2021		Sep. 30, 2020		Sep. 30, 2021		Sep. 30, 2020
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		$ (17)		$ 107		$ 124		$ 87
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales		41	[1]	50	[1]	135		165
Gross Realized Gains		4		4		11		14
Gross Realized Losses		(3)		(1)		(6)		(4)
Net Realized Gains (Losses)		1		3		5		10
Unrealized Gain (Loss) on Equity Securities		0		2		0		1
Net Gains (Losses) on Trust Investments		1		5		5		11
PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		(17)		103		120		79
PSEG Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales	[1]	387		583		1,522		1,631
Gross Realized Gains		32		91		194		161
Gross Realized Losses		(17)		(23)		(55)		(77)
Net Realized Gains (Losses)	[2]	15		68		139		84
Unrealized Gain (Loss) on Equity Securities		(33)		34		(20)		(5)
Impairment of Debt Securities		0		0		0	[3]	(3)
Net Gains (Losses) on Trust Investments		$ (18)		$ 102		$ 119		$ 76

[1] Includes activity in accounts related to the liquidation of funds being transitioned within the trust.

[2] The cost of these securities was determined on the basis of specific identification.

[3] PSEG Power recognized an impairment of available-for-sale debt securities in 2020. PSEG Power’s policy is to sell all securities that are rated below investment grade.