Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2020		Dec. 31, 2019
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Cost	$ 1,898		$ 1,858
Gross Unrealized Gains	391		374
Gross Unrealized Losses	(39)		(18)
Trust Investments, Fair Value	2,250	[1]	2,214	[2]
NDT Fund Foreign Currency	1		2
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Cost	233		228
Gross Unrealized Gains	26		18
Gross Unrealized Losses	0		0
Trust Investments, Fair Value	259		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	1,067		1,033
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	68		33
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2		3
Debt Securities, Available-for-Sale, Fair Value	1,133		1,063
Total Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	212		207
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	21		11
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		0
Debt Securities, Available-for-Sale, Fair Value	233		218
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	831		825
Equity Securities, Accumulated Gross Unrealized Gain	323		341
Equity Securities, Accumulated Gross Unrealized Loss	37		15
Equity Securities, Fair Value	1,117		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	554		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	2		1
Debt Securities, Available-for-Sale, Fair Value	587		486
Corporate Debt Obligations [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	125		107
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	11		7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		0
Debt Securities, Available-for-Sale, Fair Value	136		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	513		563
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	33		16
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		2
Debt Securities, Available-for-Sale, Fair Value	546		577
Government Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	87		100
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	10		4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		0
Debt Securities, Available-for-Sale, Fair Value	97		104
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	395		400
Equity Securities, Accumulated Gross Unrealized Gain	79		103
Equity Securities, Accumulated Gross Unrealized Loss	26		11
Equity Securities, Fair Value	448		492
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	436		425
Equity Securities, Accumulated Gross Unrealized Gain	244		238
Equity Securities, Accumulated Gross Unrealized Loss	11		4
Equity Securities, Fair Value	669		659
Domestic Equity Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	21		21
Equity Securities, Accumulated Gross Unrealized Gain	5		7
Equity Securities, Accumulated Gross Unrealized Loss	0		0
Equity Securities, Fair Value	$ 26		$ 28

[1] The NDT Fund Investments table excludes foreign currency of $1 million as of June 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.