Organization and Basis of Presentation Organization and Basis of Presentation (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents		$ 803	$ 543
Cash, Cash Equivalents and Restricted Cash		841	572	$ 842	$ 176
Public Service Electric and Gas Company [Member]
Cash and Cash Equivalents		631	204
Restricted Cash in Other Current Assets		14	7
Restricted Cash in Other Noncurrent Assets		24	22
Cash, Cash Equivalents and Restricted Cash		669	233	126	50
PSEG Power [Member]
Cash and Cash Equivalents		27	27
Restricted Cash in Other Current Assets		0	0
Restricted Cash in Other Noncurrent Assets		0	0
Cash, Cash Equivalents and Restricted Cash		27	27	$ 14	$ 21
Other Entities [Member]
Cash and Cash Equivalents	[1]	145	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]	145	312
Other Current Assets [Member]
Restricted Cash in Other Current Assets		14	7
Other Noncurrent Assets [Member]
Restricted Cash in Other Noncurrent Assets		$ 24	$ 22

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