Organization, Basis Of Presentation And Summary Of Significant Accounting Policies (Amounts And Average Rates Used To Calculate IDC Or AFUDC) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
PSE&G [Member]
AFUDC amount	$ 13	$ 7	$ 1
Average Rate	6.56%	6.22%	0.88%
Power [Member]
IDC amount	$ 30	$ 78	$ 58
Average Rate	5.91%	6.57%	6.78%