Asset Retirement Obligations (AROs) (Impact Of The Revisions On Asset Retirement Obligation) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		$ 1,087	$ 1,063
Liabilities Settled		(9)	(19)
Liabilities Incurred			3
Accretion Expense		42	40
Accretion Expense Deferred and Recovered in Rate Base	[1]	17	16
Revision to Present Value of Future Cash Flows		75	(16)
ARO Liability, Ending Balance		1,212	1,087
Public Service Electric and Gas Company
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		303	302
Liabilities Settled		(7)	(18)
Liabilities Incurred			1
Accretion Expense		0	0
Accretion Expense Deferred and Recovered in Rate Base	[1]	17	16
Revision to Present Value of Future Cash Flows		1	2
ARO Liability, Ending Balance		314	303
PSEG Power LLC
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		781	758
Liabilities Settled		(2)	(1)
Liabilities Incurred			2
Accretion Expense		42	40
Accretion Expense Deferred and Recovered in Rate Base	[1]	0	0
Revision to Present Value of Future Cash Flows		74	(18)
ARO Liability, Ending Balance		895	781
Other [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		3	3
Liabilities Settled		0	0
Liabilities Incurred			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	0
ARO Liability, Ending Balance		$ 3	$ 3

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