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, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		$ 201		$ 39		$ (20)		$ 167
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales		61	[1]	42	[1]	115	[2]	86	[2]
Gross Realized Gains		5		1		10		2
Gross Realized Losses		(2)		0		(3)		(1)
Net Realized Gains (Losses)	[3]	3		1		7		1
Unrealized Gain (Loss) on Equity Securities		4		0		(1)		3
Net Gains (Losses) on Trust Investments		7		1		6		4
PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		196		38		(24)		164
PSEG Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales	[1]	493		427		1,048		880
Gross Realized Gains		32		18		70		63
Gross Realized Losses		(20)		(13)		(54)		(32)
Net Realized Gains (Losses)	[4]	12		5		16		31
Unrealized Gain (Loss) on Equity Securities		182		33		(39)		132
Impairment of Debt Securities		0		0		(3)	[5]	0
Net Gains (Losses) on Trust Investments		$ 194		$ 38		$ (26)		$ 163

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

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

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

[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.