Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021		Sep. 30, 2021		Dec. 31, 2020
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Cost	$ 2,147		$ 2,147		$ 1,990
Gross Unrealized Gains	471		471		523
Gross Unrealized Losses	(24)		(24)		(14)
Trust Investments, Fair Value	2,594	[1]	2,594	[1]	2,499	[2]
NDT Fund Foreign Currency	1		1		2
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Cost	226		226		238
Gross Unrealized Gains	19		19		28
Gross Unrealized Losses	(2)		(2)		0
Trust Investments, Fair Value	243		243		266
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	1,315		1,315		1,083
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	33		33		66
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(11)		(11)		(2)
Debt Securities, Available-for-Sale, Fair Value	1,337		1,337		1,147
Total Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	210		210		217
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	8		8		18
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2)		(2)		0
Debt Securities, Available-for-Sale, Fair Value	216		216		235
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	832		832		907
Equity Securities, Accumulated Gross Unrealized Gain			438		457
Equity Securities, FV-NI, Unrealized Loss			(13)		(12)
Equity Securities, Fair Value	1,257		1,257		1,352
Unrealized Gains (Losses) on Equity Securities still held	(18)		69
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	608		608		528
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	20		20		39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(4)		(4)		(1)
Debt Securities, Available-for-Sale, Fair Value	624		624		566
Corporate Debt Obligations [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	106		106		123
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	5		5		12
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		0		0
Debt Securities, Available-for-Sale, Fair Value	111		111		135
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	707		707		555
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	13		13		27
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(7)		(7)		(1)
Debt Securities, Available-for-Sale, Fair Value	713		713		581
Government Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	104		104		94
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3		3		6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2)		(2)		0
Debt Securities, Available-for-Sale, Fair Value	105		105		100
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	346		346		388
Equity Securities, Accumulated Gross Unrealized Gain			116		152
Equity Securities, FV-NI, Unrealized Loss			(10)		(9)
Equity Securities, Fair Value	452		452		531
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	486		486		519
Equity Securities, Accumulated Gross Unrealized Gain			322		305
Equity Securities, FV-NI, Unrealized Loss			(3)		(3)
Equity Securities, Fair Value	805		805		821
Domestic Equity Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	16		16		21
Equity Securities, Accumulated Gross Unrealized Gain			11		10
Equity Securities, FV-NI, Unrealized Loss			0		0
Equity Securities, Fair Value	$ 27		27		$ 31
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
After tax amount of net unrealized gains recognized in AOCI			13
Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
After tax amount of net unrealized gains recognized in AOCI			$ 4

[1] The NDT Fund Investments table excludes foreign currency of $1 million as of September 30, 2021, which is part of the NDT Fund.

[2] The NDT Fund Investments table excludes foreign currency of $2 million as of December 31, 2020, which is part of the NDT Fund.