Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended				12 Months Ended
		Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2019		Jun. 30, 2018		Dec. 31, 2018
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		$ 39		$ 8		$ 167		$ (14)
PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		38		8		164		(14)
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
NDT Fund Cash		1				1
Proceeds from Sales	[1]	427		402		880		774
Trust Investments, Cost		1,826				1,826				$ 1,769
Gross Unrealized Gains		314				314				192
Gross Unrealized Losses		(24)				(24)				(83)
Trust Investments, Fair Value		2,116	[2]			2,116	[2]			1,878
Gross Realized Gains		18		34		63		58
Available-for-sale Securities, Gross Realized Losses		13		10		32		22
Realized Investment Gains (Losses)	[3]	5		24		31		36
Unrealized Gain (Loss) on Securities		33		(16)		132		(50)
Net Gains (Losses) on Trust Investments		38		8		163		(14)
NDT Fund Foreign Currency		1				1
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales		42	[1]	22	[1]	86	[4]	47	[4]
Trust Investments, Cost		226				226				228
Gross Unrealized Gains		14				14				2
Gross Unrealized Losses		0				0				(6)
Trust Investments, Fair Value		240				240				224
Gross Realized Gains		1		0		2		2
Available-for-sale Securities, Gross Realized Losses		0		0		1		2
Realized Investment Gains (Losses)	[5]	1		0		1		0
Unrealized Gain (Loss) on Securities		0		0		3		0
Net Gains (Losses) on Trust Investments		1		$ 0		4		$ 0
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		1,025				1,025				999
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		31				31				3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		3				3				24
Debt Securities, Available-for-Sale, Fair Value		1,053				1,053				978
Total Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		204				204				206
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		10				10				1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0				0				6
Debt Securities, Available-for-Sale, Fair Value		214				214				201
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost		801				801				770
Equity Securities, Accumulated Gross Unrealized Gain						283				189
Equity Securities, Accumulated Gross Unrealized Loss						21				59
Equity Securities, Fair Value		1,063				1,063				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		477				477				501
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		2				2				15
Debt Securities, Available-for-Sale, Fair Value		490				490				487
Corporate Debt Obligations [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		103				103				96
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		5				5				0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0				0				4
Debt Securities, Available-for-Sale, Fair Value		108				108				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		548				548				498
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		16				16				2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		1				1				9
Debt Securities, Available-for-Sale, Fair Value		563				563				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		5				5				1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0				0				2
Debt Securities, Available-for-Sale, Fair Value		106				106				109
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost		384				384				323
Equity Securities, Accumulated Gross Unrealized Gain						82				36
Equity Securities, Accumulated Gross Unrealized Loss						16				30
Equity Securities, Fair Value		450				450				329
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost		417				417				447
Equity Securities, Accumulated Gross Unrealized Gain						201				153
Equity Securities, Accumulated Gross Unrealized Loss						5				29
Equity Securities, Fair Value		613				613				571
Domestic Equity Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost		22				22				22
Equity Securities, Accumulated Gross Unrealized Gain						4				1
Equity Securities, Accumulated Gross Unrealized Loss						0				0
Equity Securities, Fair Value		$ 26				$ 26				$ 23

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

[2] The NDT Fund Investments table excludes cash of $1 million and foreign currency of $1 million as of June 30, 2019, which are 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.