Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jul. 02, 2010
Commitments and Contingencies [Abstract]
Environmental remediation liabilities related to Acquisition			$ 10
Amount of expenditures over which PHI is responsible for related to the Conectiv Acquisition			$ 10
Deepwater Unit 1 amount of MWs under full capacity	8
Limitation on Full Capacity of Deepwater Unit 1	78
Amount of shares distributed to holders of allowed unsecured claims	464
Amount of shares remaining in reserve for distribution to holders of disputed claims	21
Amount of shares authorized to settle unsecured claims	485
Commitments and Contingencies [Line Items]
Power generation capacity (in Megawatts)	11,064	13,553
Deepwater Unit 1
Commitments and Contingencies [Line Items]
Power generation capacity (in Megawatts)	86