Organization and Basis of Presentation Organization and Basis of Presentation (Details) - USD ($) $ in Millions		3 Months Ended
		Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Cash and Cash Equivalents				$ 966	$ 147
Cash, Cash Equivalents and Restricted Cash				999	176	$ 156	$ 199
Public Service Electric and Gas Company [Member]
Cash and Cash Equivalents				224	21
Restricted Cash in Other Current Assets				11	11
Restricted Cash in Other Noncurrent Assets				22	18
Cash, Cash Equivalents and Restricted Cash				257	50	61	61
PSEG Power [Member]
Cash and Cash Equivalents				15	21
Restricted Cash in Other Current Assets				0	0
Restricted Cash in Other Noncurrent Assets				0	0
Cash, Cash Equivalents and Restricted Cash				15	21	$ 80	$ 22
Lower of Cost or Market adjustment		$ (9)	$ 20
Asset Retirement Obligation, Revision of Estimate			$ 74
Other Entities [Member]
Cash and Cash Equivalents	[1]			727	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]			727	105
Other Current Assets [Member]
Restricted Cash in Other Current Assets				11	11
Other Noncurrent Assets [Member]
Restricted Cash in Other Noncurrent Assets				$ 22	$ 18

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