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, 2019		Sep. 30, 2018		Sep. 30, 2019		Sep. 30, 2018		Dec. 31, 2018
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		$ (3)		$ 45		$ 164		$ 31
PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		(4)		44		160		30
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales	[1]	365		231		1,245		1,005
Trust Investments, Cost		1,855				1,855				$ 1,769
Gross Unrealized Gains		306				306				192
Gross Unrealized Losses		(27)				(27)				(83)
Trust Investments, Fair Value		2,134	[2]			2,134	[2]			1,878
Gross Realized Gains		27		17		90		75
Available-for-sale Securities, Gross Realized Losses		11		7		43		29
Realized Investment Gains (Losses)	[3]	16		10		47		46
Unrealized Gain (Loss) on Securities		(21)		34		111		(16)
Net Gains (Losses) on Trust Investments		(5)		44		158		30
NDT Fund Foreign Currency		1				1
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales		43	[1]	33	[1]	129	[4]	80	[4]
Trust Investments, Cost		226				226				228
Gross Unrealized Gains		20				20				2
Gross Unrealized Losses		0				0				(6)
Trust Investments, Fair Value		246				246				224
Gross Realized Gains		3		0		5		2
Available-for-sale Securities, Gross Realized Losses		2		1		3		3
Realized Investment Gains (Losses)	[5]	1		(1)		2		(1)
Unrealized Gain (Loss) on Securities		1		2		4		2
Net Gains (Losses) on Trust Investments		2		$ 1		6		$ 1
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		1,024				1,024				999
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		40				40				3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		2				2				24
Debt Securities, Available-for-Sale, Fair Value		1,062				1,062				978
Total Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		206				206				206
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		15				15				1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0				0				6
Debt Securities, Available-for-Sale, Fair Value		221				221				201
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost		831				831				770
Equity Securities, Accumulated Gross Unrealized Gain						266				189
Equity Securities, Accumulated Gross Unrealized Loss						25				59
Equity Securities, Fair Value		1,072				1,072				900
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		480				480				501
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		18				18				1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		2				2				15
Debt Securities, Available-for-Sale, Fair Value		496				496				487
Corporate Debt Obligations [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		105				105				96
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		7				7				0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0				0				4
Debt Securities, Available-for-Sale, Fair Value		112				112				92
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		544				544				498
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		22				22				2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0				0				9
Debt Securities, Available-for-Sale, Fair Value		566				566				491
Government Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		101				101				110
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		8				8				1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0				0				2
Debt Securities, Available-for-Sale, Fair Value		109				109				109
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost		387				387				323
Equity Securities, Accumulated Gross Unrealized Gain						71				36
Equity Securities, Accumulated Gross Unrealized Loss						18				30
Equity Securities, Fair Value		440				440				329
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost		444				444				447
Equity Securities, Accumulated Gross Unrealized Gain						195				153
Equity Securities, Accumulated Gross Unrealized Loss						7				29
Equity Securities, Fair Value		632				632				571
Domestic Equity Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost		20				20				22
Equity Securities, Accumulated Gross Unrealized Gain						5				1
Equity Securities, Accumulated Gross Unrealized Loss						0				0
Equity Securities, Fair Value		$ 25				$ 25				$ 23

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

[2] The NDT Fund Investments table excludes foreign currency of $1 million as of September 30, 2019, which is part of the NDT Fund.

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

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

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