Regulatory Assets And Liabilities (Schedule Of Regulatory Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	$ 167		$ 155
Regulatory Liability, Current	100		174
Total Regulatory Liabilities	228		285
PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	167		155
Regulatory Assets	4,730		4,864
Total Regulatory Assets	4,897		5,019
Regulatory Liability, Current	100		174
Total Regulatory Liabilities	228		285
Total Regulatory Liabilities	237		293
Market Transition Charge Refund, Net [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	23	[1]	58	[1]
Total Regulatory Liabilities	0		26
Deferred Income Taxes [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	39		46
Overrecovered Gas Costs - BGSS [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	30	[1],[2]	40	[1],[2]
Excess Cost Of Removal [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	0		11
Capital Stimulus Overcollection [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	0	[1],[2]	5	[1],[2]
FERC Formula Rate True-Up [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	1		5
NGC [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	5		0
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]
Total Regulatory Liabilities	222		244
Gas Weather Normalization Deferral [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Total Regulatory Liabilities	0	[1],[2]	9	[1],[2]
Other [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Total Regulatory Liabilities	15		14
NGC [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	0	[1],[2]	66	[1],[2]
Underrecovered Electric Costs - BGS [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	28		12
Societal Benefits Charges (SBC) [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	87		74
Renewables And Energy Efficiency [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	10		0
Regulatory Assets	140	[1]	96	[1]
Regulatory Liability, Current	2		7
Capital Stimulus Undercollection [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	21		0
Gas Weather Normalization Deferral [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	2		0
OPEB Costs [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	19		0
Regulatory Assets	0	[1]	39	[1]
FERC Formula Rate True-Up [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	0	[2]	3	[2]
Stranded Costs To Be Recovered [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	1,460	[1],[2]	1,776	[1],[2]
Manufactured Gas Plant (MGP) Remediation Costs [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	635		661
Pension And Other Postretirement [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	1,280		953
Remediation Adjustment Clause (Other SBC) [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	92	[1],[2]	119	[1],[2]
Deferred Income Taxes [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	393		402
Gas Contract Mark-To-Market [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	110		50
New Jersey Clean Energy Program [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	253		430
Unamortized Loss On Reacquired Debt And Debt Expense [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	96	[2]	102	[2]
Conditional Asset Retirement Obligation [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	84		72
Repair Allowance Taxes [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	17	[1],[2]	27	[1],[2]
Regulatory Restructuring Costs [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	8		13
Gas Margin Adjustment Clause [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	29		44
Customer Care System [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	15		20
Plant And Regulatory Study Costs [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	7	[1]	9	[1]
Incurred But Not Reported Claim Reserve [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	15		14
Asbestos Abatement [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	6	[1]	7	[1]
Cape May Street Cleanup [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	9		8
Storm Damage [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	68		8
Other [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets	$ 13		$ 14

[1] Recoverable/Refundable per specific rate order

[2] Recovered/Refunded with interest