Regulatory Assets And Liabilities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2011 years months	Mar. 31, 2007 NGC [Member]	Dec. 31, 2011 Excess Cost Of Removal [Member]
Regulatory Assets And Liabilities [Line Items]
Transfer of remaining Market Transition Charge		$ 150
Period In Which Refund Is Expected Without Interest For A Deferred Tax Asset, In Months	12
Period Of Time To Recover Costs Incurred For Clean Up Of Manufactured Gas Plants, In Months	7
OPEB Costs Which Were Deferred And Amortized Over A Period Of Time, In Years	15
Repair Tax Allowances Relates To Disallowed Tax Deductions For Repair Allowance As Authorized By The BPU Which Is Recovered Over A Period Of Time, In Years	10
Costs Relating To Transition PSE And G To A Transmission And Distribution Company And The Generation Function As A Separate Corporate Entity With Recovery Over A Period Of Time, In Years	10
Refund of excess cost of removal			$ 66
Refund Of Excess Gas Cost Of Removal Accruals Over A Period Of Time, In Years	5