Commitments And Contingencies (Retained Environmental Exposures) (Details) (USD $)	1 Months Ended	9 Months Ended
	Jul. 31, 2010	Sep. 30, 2011
PHI obligation floor		$ 4,000,000
Environmental remediation expense minimum	7,000,000
Environmental remediation expense maximum	18,000,000
Accrued closure costs		5,000,000
PHI [Member]
Third party maximum and seller floor for environmental remediation costs	10,000,000
Conectiv Energy [Member]
Third party maximum and seller floor for environmental remediation costs	10,000,000
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