Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2020		Dec. 31, 2019
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Cost	$ 1,975		$ 1,858
Gross Unrealized Gains	423		374
Gross Unrealized Losses	(40)		(18)
Trust Investments, Fair Value	2,358	[1]	2,214	[2]
NDT Fund Foreign Currency	1		2
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Cost	235		228
Gross Unrealized Gains	26		18
Gross Unrealized Losses	0		0
Trust Investments, Fair Value	261		246
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,077		1,033
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	65		33
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3		3
Debt Securities, Available-for-Sale, Fair Value	1,139		1,063
Total Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	215		207
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	19		11
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		0
Debt Securities, Available-for-Sale, Fair Value	234		218
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	898		825
Equity Securities, Accumulated Gross Unrealized Gain	358		341
Equity Securities, Accumulated Gross Unrealized Loss	37		15
Equity Securities, Fair Value	1,219		1,151
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	550		470
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	35		17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3		1
Debt Securities, Available-for-Sale, Fair Value	582		486
Corporate Debt Obligations [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	124		107
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	10		7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		0
Debt Securities, Available-for-Sale, Fair Value	134		114
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	527		563
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	30		16
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		2
Debt Securities, Available-for-Sale, Fair Value	557		577
Government Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	91		100
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	9		4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		0
Debt Securities, Available-for-Sale, Fair Value	100		104
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	381		400
Equity Securities, Accumulated Gross Unrealized Gain	101		103
Equity Securities, Accumulated Gross Unrealized Loss	24		11
Equity Securities, Fair Value	458		492
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	517		425
Equity Securities, Accumulated Gross Unrealized Gain	257		238
Equity Securities, Accumulated Gross Unrealized Loss	13		4
Equity Securities, Fair Value	761		659
Domestic Equity Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	20		21
Equity Securities, Accumulated Gross Unrealized Gain	7		7
Equity Securities, Accumulated Gross Unrealized Loss	0		0
Equity Securities, Fair Value	$ 27		$ 28

[1] The NDT Fund Investments table excludes foreign currency of $1 million as of September 30, 2020, which is part of the NDT Fund.

[2] The NDT Fund Investments table excludes foreign currency of $2 million as of December 31, 2019, which is part of the NDT Fund.