Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		$ 260	$ (143)	$ 134
PSEG Power LLC
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		253	(140)	125
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power LLC
Schedule of Trust Investments [Line Items]
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale	[1]	1,614	1,398	2,137
Gross Realized Gains		107	121	157
Gross Realized Losses		(53)	(51)	(23)
Net Realized Gains (Losses)	[2]	54	70	134
Unrealized Gain (Loss) on Securities	[3]	196	(209)
Other than Temporary Impairment Losses, Investments		0	0	(12)
Net Gains (Losses) on Trust Investments		250	(139)	122
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale	[4]	173	103	182
Gross Realized Gains		7	2	17
Gross Realized Losses		(3)	(4)	(5)
Net Realized Gains (Losses)	[5]	4	(2)	12
Unrealized Gain (Loss) on Securities	[6]	6	(2)
Net Gains (Losses) on Trust Investments		$ 10	$ (4)	$ 12

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

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

[3] Effective January 1, 2018, unrealized gains (losses) on equity securities are recorded in Net Income instead of Other Comprehensive Income (Loss).

[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.

[6] Effective January 1, 2018, unrealized gains (losses) on equity securities are recorded in Net Income instead of Other Comprehensive Income (Loss).