Commitments And Contingent Liabilities (Face Value Of Outstanding Guarantees, Current Exposure And Margin Positions) (Details) (USD $) In Millions, unless otherwise specified				1 Months Ended
	Dec. 31, 2011	Jul. 06, 2011	Dec. 31, 2010	Dec. 31, 2011 PSEG [Member]	Apr. 30, 2011 Power [Member]	Apr. 30, 2011 PSEG And Power [Member]
Face Value of Outstanding Guarantees	$ 1,756		$ 1,936
Exposure under Current Guarantees	315		330
Letters of Credit Margin Posted	135		137
Letters of Credit Margin Received	91		109
Counterparty Cash Margin Deposited	20		0
Counterparty Cash Margin Received	(7)		(2)
Net Broker Balance Deposited (Received)	(92)		(28)
Additional collateral that could be Required if Power Loses Investment Grade Rating	812		828
Liquidity Available under PSEG's and Power's Credit Facilities to Post Collateral	3,415		2,750
Additional Amounts Posted Other Letters of Credit	52		98
Increase total credit capacity, due to credit agreements					650
Length of time for credit agreement, years						5
Number of states with limits on emmisions under CSAPR		28
Parent companies share of investment in Clean Air Act requirements				$ 147