Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019
Schedule of Trust Investments [Line Items]
Net Gains (Losses) on Trust Investments		$ 194		$ 253	$ 260
Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale	[1]	1,930		2,031	1,614
Gross Realized Gains		236		214	107
Gross Realized Losses		(70)		(94)	(53)
Net Realized Gains (Losses)	[2]	166		120	54
Unrealized Gain (Loss) on Securities		19		120	196
Other than Temporary Impairment Losses, Investments		0	[3]	(3)	0
Net Gains (Losses) on Trust Investments		185		237	250
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale		170		203	173
Gross Realized Gains		16		19	7
Gross Realized Losses		(8)		(6)	(3)
Net Realized Gains (Losses)		8		13	4
Unrealized Gain (Loss) on Securities		1		3	6
Net Gains (Losses) on Trust Investments		$ 9		$ 16	$ 10

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

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

[3] PSEG Power recognized an impairment of available-for-sale debt securities in 2020. PSEG Power’s policy is to sell all securities that are rated below investment grade.