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, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Cash and Cash Equivalents		$ 147	$ 177
Restricted Cash and Investments, Noncurrent		18	14
Restricted Cash and Investments, Current		11	8
Cash, Cash Equivalents and Restricted Cash		176	199	$ 315	$ 426
Public Service Electric and Gas Company
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Cash and Cash Equivalents		21	39
Restricted Cash and Investments, Noncurrent		18	14
Restricted Cash and Investments, Current		11	8
Cash, Cash Equivalents and Restricted Cash		50	61	244	393
PSEG Power LLC
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Cash and Cash Equivalents		21	22
Restricted Cash and Investments, Noncurrent		0	0
Restricted Cash and Investments, Current		0	0
Cash, Cash Equivalents and Restricted Cash		21	22	$ 32	$ 11
Other [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Cash and Cash Equivalents		105	116
Restricted Cash and Investments, Noncurrent		0	0
Restricted Cash and Investments, Current		0	0
Cash, Cash Equivalents and Restricted Cash	[1]	$ 105	$ 116

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