Organization and Basis of Presentation Organization and Basis of Presentation (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents		$ 799	$ 147
Cash, Cash Equivalents and Restricted Cash		842	176	$ 96	$ 199
Public Service Electric and Gas Company [Member]
Cash and Cash Equivalents		83	21
Restricted Cash in Other Current Assets		22	11
Restricted Cash in Other Noncurrent Assets		21	18
Cash, Cash Equivalents and Restricted Cash		126	50	46	61
PSEG Power [Member]
Cash and Cash Equivalents		14	21
Restricted Cash in Other Current Assets		0	0
Restricted Cash in Other Noncurrent Assets		0	0
Cash, Cash Equivalents and Restricted Cash		14	21	$ 28	$ 22
Lower of Cost or Market adjustment		20
Asset Retirement Obligation, Revision of Estimate		74
Other Entities [Member]
Cash and Cash Equivalents	[1]	702	105
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]	702	105
Other Current Assets [Member]
Restricted Cash in Other Current Assets		22	11
Other Noncurrent Assets [Member]
Restricted Cash in Other Noncurrent Assets		$ 21	$ 18

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