Organization and Basis of Presentation Organization and Basis of Presentation (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents		$ 118	$ 313
Cash, Cash Equivalents and Restricted Cash		134	315	$ 197	$ 426
PSE And G [Member]
Cash and Cash Equivalents		48	242
Cash, Cash Equivalents and Restricted Cash		64	244	157	393
Power [Member]
Cash and Cash Equivalents		11	32
Cash, Cash Equivalents and Restricted Cash		11	32	$ 18	$ 11
Other Entities [Member]
Cash and Cash Equivalents	[1]	59	39
Cash, Cash Equivalents and Restricted Cash	[1]	59	39
Other Current Assets [Member]
Restricted Cash in Other Current Assets		14	0
Other Current Assets [Member] | PSE And G [Member]
Restricted Cash in Other Current Assets		14	0
Other Current Assets [Member] | Power [Member]
Restricted Cash in Other Current Assets		0	0
Other Current Assets [Member] | Other Entities [Member]
Restricted Cash in Other Current Assets	[1]	0	0
Other Noncurrent Assets [Member]
Restricted Cash in Other Noncurrent Assets		2	2
Other Noncurrent Assets [Member] | PSE And G [Member]
Restricted Cash in Other Noncurrent Assets		2	2
Other Noncurrent Assets [Member] | Power [Member]
Restricted Cash in Other Noncurrent Assets		0	0
Other Noncurrent Assets [Member] | Other Entities [Member]
Restricted Cash in Other Noncurrent Assets	[1]	$ 0	$ 0

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