Organization, Basis Of Presentation And Summary Of Significant Accounting Policies Organization, Basic of Presentation And Summary Of Significant Accounting Policies (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Cash and Cash Equivalents		$ 543	$ 147
Restricted Cash and Investments, Noncurrent		22	18
Restricted Cash and Investments, Current		7	11
Cash, Cash Equivalents and Restricted Cash		572	176	$ 199	$ 315
Public Service Electric and Gas Company
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Cash and Cash Equivalents		204	21
Restricted Cash and Investments, Noncurrent		22	18
Restricted Cash and Investments, Current		7	11
Cash, Cash Equivalents and Restricted Cash		233	50	61	244
PSEG Power LLC
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Cash and Cash Equivalents		27	21
Restricted Cash and Investments, Noncurrent		0	0
Restricted Cash and Investments, Current		0	0
Cash, Cash Equivalents and Restricted Cash		27	21	$ 22	$ 32
Other [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Cash and Cash Equivalents		312	105
Restricted Cash and Investments, Noncurrent		0	0
Restricted Cash and Investments, Current		0	0
Cash, Cash Equivalents and Restricted Cash	[1]	$ 312	$ 105

[1] Includes amounts applicable to PSEG (parent company), Energy Holdings and Services.