Commitments And Contingent Liabilities (Face Value Of Outstanding Guarantees, Current Exposure and Margin Positions) (Details) (USD $) In Millions, unless otherwise specified			1 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Apr. 30, 2011 Power [Member]	Apr. 30, 2011 PSEG And Power [Member]
Face value of outstanding guarantees	$ 1,838	$ 1,936
Exposure under current guarantees	270	330
Letters of credit margin posted	185	137
Letters of credit margin received	49	109
Counterparty cash margin deposited	0	0
Counterparty cash margin received	(7)	(2)
Net Broker Balance Deposited (Received)	31	(28)
Additional collateral that could be required if power loses investment grade rating	771	828
Liquidity available under PSEG's and Power's credit facilities to post collateral	3,416	2,750
Additional amounts posted other letters of credit	98	98
Increase total credit capacity, due to credit agreements			$ 650
Length of time for credit agreement, years				5