Discontinued Operations And Dispositions (Operating Results Reclassified To Discontinued Operations) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Income (Loss)	$ 29	$ 20	$ 96	$ 15
Power [Member] | PSEG Texas [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues	20	140	112	341
Income (Loss ) Before Income Taxes	6	31	26	25
Net Income (Loss)	4	20	17	15
Power [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Income (Loss)	$ 29	$ 20	$ 96	$ 15