Asset Retirement Obligations (AROs) (Impact Of The Revisions On Asset Retirement Obligation) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		$ 1,063	$ 1,024
Liabilities Settled		(19)	(10)
Liabilities Incurred		3	1
Accretion Expense		40	41
Accretion Expense Deferred and Recovered in Rate Base	[1]	16	12
Revision to Present Value of Future Cash Flows		(16)	(5)
ARO Liability, Ending Balance		1,087	1,063
Public Service Electric and Gas Company
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		302	212
Liabilities Settled		(18)	(9)
Liabilities Incurred		1	0
Accretion Expense		0	0
Accretion Expense Deferred and Recovered in Rate Base	[1]	16	12
Revision to Present Value of Future Cash Flows		2	87
ARO Liability, Ending Balance		303	302
PSEG Power LLC
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		758	810
Liabilities Settled		(1)	(1)
Liabilities Incurred		2	1
Accretion Expense		40	41
Accretion Expense Deferred and Recovered in Rate Base	[1]	0	0
Revision to Present Value of Future Cash Flows		(18)	(93)
ARO Liability, Ending Balance		781	758
Other [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		3	2
Liabilities Settled		0	0
Liabilities Incurred		0	0
Accretion Expense		0	0
Accretion Expense Deferred and Recovered in Rate Base	[1]	0	0
Revision to Present Value of Future Cash Flows		0	1
ARO Liability, Ending Balance		$ 3	$ 3

[1] Not reflected as expense in Consolidated Statements of Operations