Organization and Basis of Presentation Organization and Basis of Presentation (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash and Cash Equivalents			$ 431	$ 147
Cash, Cash Equivalents and Restricted Cash			467	176	$ 115	$ 199
Public Service Electric and Gas Company [Member]
Cash and Cash Equivalents			258	21
Restricted Cash in Other Current Assets			15	11
Restricted Cash in Other Noncurrent Assets			21	18
Cash, Cash Equivalents and Restricted Cash			294	50	56	61
PSEG Power [Member]
Cash and Cash Equivalents			17	21
Restricted Cash in Other Current Assets			0	0
Restricted Cash in Other Noncurrent Assets			0	0
Cash, Cash Equivalents and Restricted Cash			17	21	$ 14	$ 22
Lower of Cost or Market adjustment		$ 20
Asset Retirement Obligation, Revision of Estimate			74
Other Entities [Member]
Cash and Cash Equivalents	[1]		156	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]		156	105
Other Current Assets [Member]
Restricted Cash in Other Current Assets			15	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.