Asset Retirement Obligations (AROs) (Impact Of The Revisions On Asset Retirement Obligation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
PSEG [Member]
ARO Liability, Beginning Balance	$ 489		$ 461
Liabilities Settled	(5)		(6)
Liabilities Incurred	11		2
Accretion Expense	21		19
Accretion Expense Deferred and Recovered in Rate Base	14	[1]	13	[1]
Revision to Present Values of Estimated Cash Flows	97
ARO Liability, Ending Balance	627		489
Power [Member]
ARO Liability, Beginning Balance	259		242
Liabilities Settled	(1)		(1)
Liabilities Incurred	1		0
Accretion Expense	21		18		18
Accretion Expense Deferred and Recovered in Rate Base	0	[1]	0	[1]
Revision to Present Values of Estimated Cash Flows	89
ARO Liability, Ending Balance	369		259		242
PSE&G [Member]
ARO Liability, Beginning Balance	226		216
Liabilities Settled	(5)		(5)
Liabilities Incurred	7		2
Accretion Expense	0		0
Accretion Expense Deferred and Recovered in Rate Base	14	[1]	13	[1]
Revision to Present Values of Estimated Cash Flows	8
ARO Liability, Ending Balance	250		226
Other [Member]
ARO Liability, Beginning Balance	4		3
Liabilities Settled	1		0
Liabilities Incurred	3		0
Accretion Expense	0		1
Revision to Present Values of Estimated Cash Flows	0	[1]
ARO Liability, Ending Balance	$ 8		$ 4

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