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				9 Months Ended
		Sep. 30, 2019		Sep. 30, 2018		Sep. 30, 2019		Sep. 30, 2018
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		$ (3)		$ 45		$ 164		$ 31
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales		43	[1]	33	[1]	129	[2]	80	[2]
Gross Realized Gains		3		0		5		2
Gross Realized Losses		(2)		(1)		(3)		(3)
Net Realized Gains (Losses)	[3]	1		(1)		2		(1)
Unrealized Gain (Loss) on Securities		1		2		4		2
Net Gains (Losses) on Trust Investments		2		1		6		1
PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		(4)		44		160		30
PSEG Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sales	[1]	365		231		1,245		1,005
Gross Realized Gains		27		17		90		75
Gross Realized Losses		(11)		(7)		(43)		(29)
Net Realized Gains (Losses)	[4]	16		10		47		46
Unrealized Gain (Loss) on Securities		(21)		34		111		(16)
Net Gains (Losses) on Trust Investments		$ (5)		$ 44		$ 158		$ 30

[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.