Commitments And Contingent Liabilities (Regulatory Proceedings) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012 MW
Loss Contingencies [Line Items]
New combined cycle generating facilities to be built under LCAPP, MW	1,949
Mid-merit electric power generation capacity to be built under LCAPP	2,000
PSE And 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 And G [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program	1,200
Discounted liability recorded-current	199