Asset Retirement Obligations (AROs) (Impact Of The Revisions On Asset Retirement Obligation) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		$ 726	$ 679
Liabilities Settled		(29)	(13)
Liabilities Incurred		1	25
Accretion Expense		30	26
Accretion Expense Deferred and Recovered in Rate Base	[1]	12	12
Asset Retirement Obligation, Revision of Estimate		284	(3)
ARO Liability, Ending Balance		1,024	726
PSE&G [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		213	218
Liabilities Settled		(8)	(9)
Liabilities Incurred		0	2
Accretion Expense		0	0
Accretion Expense Deferred and Recovered in Rate Base	[1]	12	12
Asset Retirement Obligation, Revision of Estimate		(5)	(10)
ARO Liability, Ending Balance		212	213
Power [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		511	457
Liabilities Settled		(21)	(4)
Liabilities Incurred		1	23
Accretion Expense		30	26
Accretion Expense Deferred and Recovered in Rate Base	[1]	0	0
Asset Retirement Obligation, Revision of Estimate		289	9
ARO Liability, Ending Balance		810	511
Other [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO Liability, Beginning Balance		2	4
Liabilities Settled		0	0
Liabilities Incurred		0	0
Accretion Expense		0	0
Accretion Expense Deferred and Recovered in Rate Base	[1]	0	0
Asset Retirement Obligation, Revision of Estimate		0	(2)
ARO Liability, Ending Balance		$ 2	$ 2

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