Commitments And Contingencies (Retained Environmental Exposures) (Details) (USD $)	1 Months Ended		6 Months Ended	1 Months Ended		6 Months Ended	12 Months Ended	1 Months Ended
	May 31, 2011	Jul. 31, 2010	Jun. 30, 2011	Jul. 31, 2010 PHI [Member]	Jul. 31, 2010 Conectiv Energy [Member]	Jun. 30, 2011 Conectiv Energy [Member]	Dec. 31, 2007 Conectiv Energy [Member]	May 31, 2011 NJDEP [Member]
Third party maximum and seller floor for environmental remediation costs					$ 10,000,000
PHI obligation floor			4,000,000
Obligation floor				10,000,000
Environmental remediation expense minimum		7,000,000
Environmental remediation expense maximum		18,000,000
Minimum estimated costs for closure of the operations						2,000,000
Maximum estimated costs for closure of the operations						3,000,000
Minimum estimated annual post closure operation, maintenance and monitoring costs, per year						120,000
Maximum estimated annual post closure operation, maintenance and monitoring costs, per year						193,000
Number of years						30
Accrued closure costs			5,000,000
Legal penalties							2,000,000
Stipulation of settlement, required payment	$ 50,000							$ 96,000