Organization and Basis of Presentation Organization and Basis of Presentation (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents		$ 65	$ 177
Cash, Cash Equivalents and Restricted Cash		96	199	$ 134	$ 315
PSE And G [Member]
Cash and Cash Equivalents		15	39
Restricted Cash in Other Current Assets		15	8
Restricted Cash in Other Noncurrent Assets		16	14
Cash, Cash Equivalents and Restricted Cash		46	61	64	244
Power [Member]
Cash and Cash Equivalents		28	22
Restricted Cash in Other Current Assets		0	0
Restricted Cash in Other Noncurrent Assets		0	0
Cash, Cash Equivalents and Restricted Cash		28	22	$ 11	$ 32
Other Entities [Member]
Cash and Cash Equivalents	[1]	22	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]	22	116
Other Current Assets [Member]
Restricted Cash in Other Current Assets		15	8
Other Noncurrent Assets [Member]
Restricted Cash in Other Noncurrent Assets		$ 16	$ 14

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