Document And Entity Information	9 Months Ended
Sep. 30, 2011	Oct. 14, 2011
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Entity Registrant Name	PUBLIC SERVICE ENTERPRISE GROUP INC
Entity Central Index Key	0000788784
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Power [Member]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Entity Registrant Name	PSEG POWER LLC
Entity Central Index Key	0001158659
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		0
PSE&G [Member]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Entity Registrant Name	PUBLIC SERVICE ELECTRIC & GAS CO
Entity Central Index Key	0000081033
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		132,450,344
PSEG [Member]
Entity Common Stock, Shares Outstanding		505,904,850

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