Organization and Basis of Presentation Organization and Basis of Presentation (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Cash and Cash Equivalents		$ 107	$ 543
Cash, Cash Equivalents and Restricted Cash		144	572	$ 467	$ 176
Public Service Electric and Gas Company [Member]
Cash and Cash Equivalents		40	204
Restricted Cash in Other Current Assets		21	7
Restricted Cash in Other Noncurrent Assets		16	22
Cash, Cash Equivalents and Restricted Cash		77	233	294	50
PSEG Power [Member]
Cash and Cash Equivalents		2	27
Restricted Cash in Other Current Assets		0	0
Restricted Cash in Other Noncurrent Assets		0	0
Cash, Cash Equivalents and Restricted Cash		2	27	$ 17	$ 21
Other Entities [Member]
Cash and Cash Equivalents	[1]	65	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]	65	312
Other Current Assets [Member]
Restricted Cash in Other Current Assets		21	7
Other Noncurrent Assets [Member]
Restricted Cash in Other Noncurrent Assets		$ 16	$ 22

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