Document And Entity Information (USD $)	12 Months Ended			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011 Power [Member]	Jan. 31, 2012 Power [Member]	Dec. 31, 2011 PSE&G [Member]	Jan. 31, 2012 PSE&G [Member]	Jan. 31, 2012 PSEG [Member]	Jun. 30, 2011 PSEG [Member]
Document Type	10-K	10-K		10-K
Amendment Flag	false	false		false
Document Period End Date	Dec. 31, 2011	Dec. 31, 2011		Dec. 31, 2011
Document Fiscal Year Focus	2011	2011		2011
Document Fiscal Period Focus	FY	FY		FY
Entity Registrant Name	PUBLIC SERVICE ENTERPRISE GROUP INC	PSEG POWER LLC		PUBLIC SERVICE ELECTRIC & GAS CO
Entity Central Index Key	0000788784	0001158659		0000081033
Current Fiscal Year End Date	--12-31	--12-31		--12-31
Entity Filer Category	Large Accelerated Filer	Non-accelerated Filer		Non-accelerated Filer
Entity Common Stock, Shares Outstanding			0		132,450,344	506,050,478
Entity Well-known Seasoned Issuer	Yes	No		Yes
Entity Voluntary Filers	No	No		No
Entity Current Reporting Status	Yes	Yes		Yes
Entity Public Float							$ 16,495,247,274