Organization and Basis of Presentation Organization and Basis of Presentation (Details) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents		$ 120	$ 177
Cash, Cash Equivalents and Restricted Cash		156	199	$ 106	$ 315
Public Service Electric and Gas Company [Member]
Cash and Cash Equivalents		25	39
Restricted Cash in Other Current Assets		18	8
Restricted Cash in Other Noncurrent Assets		18	14
Cash, Cash Equivalents and Restricted Cash		61	61	43	244
PSEG Power [Member]
Cash and Cash Equivalents		80	22
Restricted Cash in Other Current Assets		0	0
Restricted Cash in Other Noncurrent Assets		0	0
Cash, Cash Equivalents and Restricted Cash		80	22	$ 41	$ 32
Other Entities [Member]
Cash and Cash Equivalents	[1]	15	116
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]	15	116
Other Current Assets [Member]
Restricted Cash in Other Current Assets		18	8
Other Noncurrent Assets [Member]
Restricted Cash in Other Noncurrent Assets		$ 18	$ 14

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