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				6 Months Ended
		Jun. 30, 2021		Jun. 30, 2020		Jun. 30, 2021		Jun. 30, 2020
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		$ 81		$ 201		$ 141		$ (20)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales		29	[1]	61	[1]	94		115
Gross Realized Gains		2		5		7		10
Gross Realized Losses		(1)		(2)		(3)		(3)
Net Realized Gains (Losses)		1		3		4		7
Unrealized Gain (Loss) on Equity Securities		0		4		0		(1)
Net Gains (Losses) on Trust Investments		1		7		4		6
PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		79		196		137		(24)
PSEG Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales	[1]	538		493		1,135		1,048
Gross Realized Gains		83		32		162		70
Gross Realized Losses		(23)		(20)		(38)		(54)
Net Realized Gains (Losses)	[2]	60		12		124		16
Unrealized Gain (Loss) on Equity Securities		20		182		13		(39)
Impairment of Debt Securities		0		0		0	[3]	(3)
Net Gains (Losses) on Trust Investments		$ 80		$ 194		$ 137		$ (26)

[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.