Commitments And Contingent Liabilities (Regulatory Proceedings) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011 mW
Loss Contingencies [Line Items]
New combined cycle generating facilities to be built under LCAPP	1,949
Mid-merit electric power generation capacity to be built under LCAPP	2,000
PSE&G [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program	705
New Jersey Clean Energy Program Unfavorable Regulatory Action [Member] | PSE&G [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program	1,200
Discounted liability recorded-total	253
Discounted liability recorded-current	214
Discounted liability recorded-noncurrent	39