Regulatory Assets And Liabilities (Schedule Of Regulatory Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	$ 349		$ 167
Regulatory Assets, Noncurrent	3,830		3,805
Regulatory Liability, Current	67		100
Regulatory Liabilities, Noncurrent	209		228
PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	349		167
Regulatory Assets, Noncurrent	3,830		3,805
Total Noncurrent Regulatory Assets	4,543		4,730
Total Regulatory Assets	4,892		4,897
Regulatory Liability, Current	67		100
Regulatory Liabilities, Noncurrent	209		228
Total Noncurrent Regulatory Liabilities	219		237
Total Regulatory Liabilities	286		337
Market Transition Charge Refund, net [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	0	[1]	23	[1]
Deferred Income Taxes [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	32		39
Overrecovered Gas Costs - BGSS [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	21	[1],[2]	30	[1],[2]
FERC Formula Rate True-Up [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	5	[1],[2]	1	[1],[2]
NGC [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	9	[1],[2]	5	[1],[2]
BGS Retail Adder [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	0		2
Electric Cost Of Removal [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liabilities, Noncurrent	166		222
Gas Forward Contract Purchases [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liabilities, Noncurrent	40		0
Other Regulatory Liabilities [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liabilities, Noncurrent	13	[2]	15	[2]
Underrecovered Electric Costs - BGS [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	0	[1],[2]	28	[1],[2]
Societal Benefits Charges (SBC) [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	74	[1],[2]	87	[1],[2]
Solar or EE Recovery Charge (RRC) [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	33	[1],[2]	6	[1],[2]
Regulatory Assets, Noncurrent	142	[1]	140	[1]
Solar Pilot Revoery Charge (SPRC) [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	14		4
Capital Stimulus Undercollection [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	34	[1],[2]	21	[1],[2]
Gas Weather Normalization Deferral [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	30	[1]	2	[1]
Regulatory Assets, Noncurrent	27		0
New Jersey Clean Energy Program [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	154	[1],[2]	0	[1],[2]
Regulatory Assets, Noncurrent	0	[1],[2]	253	[1],[2]
Stranded Costs To Be Recovered [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	1,112	[1],[2]	1,460	[1],[2]
Manufactured Gas Plant (MGP) Remediation Costs [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	588	[1]	635	[1]
Pension And Other Postretirement [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	1,550		1,280
Deferred Income Taxes [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	405		393
Remediation Adjustment Clause (Other SBC) [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	88	[1],[2]	92	[1],[2]
Mark-To-Market Contracts [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	107	[2]	110	[2]
Unamortized Loss On Reacquired Debt And Debt Expense [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	89	[2]	96	[2]
Conditional Asset Retirement Obligation [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	110		84
Gas Margin Adjustment Clause [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	7	[1]	29	[1]
Storm Damage Deferral [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	244		68
Other [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	10		19
Regulatory Assets, Noncurrent	$ 74		$ 90

[1] Recoverable/Refundable per specific rate order

[2] Recovered/Refunded with interest