Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		$ 253		$ 260		$ (143)
PSEG Power LLC
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		241		253		(140)
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power LLC
Schedule of Trust Investments [Line Items]
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale	[1]	2,031		1,614		1,398
Gross Realized Gains		214		107		121
Gross Realized Losses		(94)		(53)		(51)
Net Realized Gains (Losses)	[2]	120		54		70
Unrealized Gain (Loss) on Securities		120		196		(209)
Other than Temporary Impairment Losses, Investments		(3)	[3]	0		0
Net Gains (Losses) on Trust Investments		237		250		(139)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale		203	[4]	173	[4]	103
Gross Realized Gains		19		7		2
Gross Realized Losses		(6)		(3)		(4)
Net Realized Gains (Losses)	[5]	13		4		(2)
Unrealized Gain (Loss) on Securities		3		6		(2)
Net Gains (Losses) on Trust Investments		$ 16		$ 10		$ (4)

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

[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 that it intends to sell. PSEG Power’s policy is to sell all such securities that are rated below investment grade.

[4] Includes activity in accounts related to the liquidation of funds being transitioned to new managers.

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