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
		Mar. 31, 2020		Mar. 31, 2019
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		$ (221)		$ 128
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales	[1]	54		44
Gross Realized Gains		5		1
Gross Realized Losses		(1)		(1)
Net Realized Gains (Losses)	[2]	4		0
Unrealized Gain (Loss) on Equity Securities		(5)		3
Net Gains (Losses) on Trust Investments		(1)		3
PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		(220)		126
PSEG Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales	[3]	555		453
Gross Realized Gains		38		45
Gross Realized Losses		(34)		(19)
Net Realized Gains (Losses)	[4]	4		26
Unrealized Gain (Loss) on Equity Securities		(221)		99
Unrealized Losses on Debt Securities		(3)	[5]	0
Net Gains (Losses) on Trust Investments		$ (220)		$ 125

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

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

[5] 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.