Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities in the NDT and Rabbi Trusts) (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2019		Jun. 30, 2018
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		$ 39		$ 8		$ 167		$ (14)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales		42	[1]	22	[1]	86	[2]	47	[2]
Gross Realized Gains		1		0		2		2
Gross Realized Losses		0		0		(1)		(2)
Net Realized Gains (Losses)	[3]	1		0		1		0
Unrealized Gain (Loss) on Securities		0		0		3		0
Net Gains (Losses) on Trust Investments		1		0		4		0
PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		38		8		164		(14)
PSEG Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales	[1]	427		402		880		774
Gross Realized Gains		18		34		63		58
Gross Realized Losses		(13)		(10)		(32)		(22)
Net Realized Gains (Losses)	[4]	5		24		31		36
Unrealized Gain (Loss) on Securities		33		(16)		132		(50)
Net Gains (Losses) on Trust Investments		$ 38		$ 8		$ 163		$ (14)

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

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

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

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