Organization and Basis of Presentation Organization and Basis of Presentation (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Cash and Cash Equivalents		$ 1,811	$ 543
Cash, Cash Equivalents and Restricted Cash		1,860	572	$ 999	$ 176
Public Service Electric and Gas Company [Member]
Cash and Cash Equivalents		461	204
Restricted Cash in Other Current Assets		33	7
Restricted Cash in Other Noncurrent Assets		15	22
Cash, Cash Equivalents and Restricted Cash		509	233	257	50
PSEG Power [Member]
Cash and Cash Equivalents		2	27
Restricted Cash in Other Current Assets		1	0
Restricted Cash in Other Noncurrent Assets		0	0
Cash, Cash Equivalents and Restricted Cash		3	27	$ 15	$ 21
Asset Retirement Obligation, Revision of Estimate		51
Other Entities [Member]
Cash and Cash Equivalents	[1]	1,348	312
Restricted Cash in Other Current Assets	[1]	0	0
Restricted Cash in Other Noncurrent Assets	[1]	0	0
Cash, Cash Equivalents and Restricted Cash	[1]	1,348	312
Other Current Assets [Member]
Restricted Cash in Other Current Assets		34	7
Other Noncurrent Assets [Member]
Restricted Cash in Other Noncurrent Assets		$ 15	$ 22

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