Organization, Basis Of Presentation And Summary Of Significant Accounting Policies (Amounts And Average Rates Used To Calculate IDC Or AFUDC) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Public Service Electric and Gas Company
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
IDC/AFUDC	$ 112	$ 81	$ 70
Average Rate	7.86%	7.22%	7.74%
PSEG Power LLC
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
IDC/AFUDC	$ 10	$ 27	$ 67
Average Rate	4.60%	4.60%	4.60%