Discontinued Operations And Dispositions (Operating Results Reclassified To Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Income (Loss)	$ 0	$ 29	$ 3	$ 64	$ (8)	$ 20	$ 2	$ (7)	$ 96	$ 7	$ (2)
Power [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Income (Loss)	0	29	3	64	(8)	20	2	(7)	96	7	(2)
PSEG Texas [Member] | Power [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues									112	402	371
Income Before Income Taxes									26	15	0
Net Income (Loss)									$ 17	$ 7	$ (2)