Financial Information By Business Segments (Financial Information By Business Segments) (Details) (USD $) In Millions	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010		Dec. 31, 2010
Net Income (Loss)	$ 323		$ 224		$ 849		$ 715
Total Assets	28,789				28,789				29,909
Power [Member]
Total Operating Revenues	1,285		1,264		3,252		3,460
Income (Loss) from Continuing Operations	205		202		502		573
Income (Loss) from Discontinued Operations, including Gain on Disposal, net of tax	3		2		67		(5)
Net Income (Loss)	208		204		569		568
Preferred Securities Dividends							0
Segments Earnings (Loss)	208		204		569		568
Gross Additions to Long-Lived Assets	168		154		323		328
Total Assets	10,517				10,517				11,452
Investments in Equity Method Subsidiaries					29				25
PSE&G [Member]
Total Operating Revenues	1,571		1,536		3,877		3,980
Income (Loss) from Continuing Operations	105		3		268		121
Income (Loss) from Discontinued Operations, including Gain on Disposal, net of tax	0		0		0		0
Net Income (Loss)	105		3		268		121
Preferred Securities Dividends							(1)
Segments Earnings (Loss)	105		3		268		120
Gross Additions to Long-Lived Assets	335		348		674		530
Total Assets	16,697				16,697				16,873
Investments in Equity Method Subsidiaries					0				0
Energy Holdings [Member]
Total Operating Revenues	21		20		41		56
Income (Loss) from Continuing Operations	5		12		2		19
Income (Loss) from Discontinued Operations, including Gain on Disposal, net of tax	0		0		0		0
Net Income (Loss)	5		12		2		19
Preferred Securities Dividends							0
Segments Earnings (Loss)	5		12		2		19
Gross Additions to Long-Lived Assets	0		14		1		49
Total Assets	2,205				2,205				2,234
Investments in Equity Method Subsidiaries					112				105
PSEG Other [Member]
Total Operating Revenues	(408)	[1]	(459)	[1]	(1,347)	[1]	(1,562)	[1]
Income (Loss) from Continuing Operations	5	[1]	5	[1]	10	[1]	7	[1]
Income (Loss) from Discontinued Operations, including Gain on Disposal, net of tax	0	[1]	0	[1]	0	[1]	0	[1]
Net Income (Loss)	5	[1]	5	[1]	10	[1]	7	[1]
Preferred Securities Dividends							1	[1]
Segments Earnings (Loss)	5	[1]	5	[1]	10	[1]	8	[1]
Gross Additions to Long-Lived Assets	2	[1]	3	[1]	4	[1]	4	[1]
Total Assets	(630)	[1]			(630)	[1]			(650)	[1]
Investments in Equity Method Subsidiaries					0	[1]			0	[1]
Consolidated [Member]
Total Operating Revenues	2,469		2,361		5,823		5,934
Income (Loss) from Continuing Operations	320		222		782		720
Income (Loss) from Discontinued Operations, including Gain on Disposal, net of tax	3		2		67		(5)
Net Income (Loss)	323		224		849		715
Preferred Securities Dividends							0
Segments Earnings (Loss)	323		224		849		715
Gross Additions to Long-Lived Assets	505		519		1,002		911
Total Assets	28,789				28,789				29,909
Investments in Equity Method Subsidiaries					$ 141				$ 130

[1] Other activities include amounts applicable to PSEG (as parent company), Services and intercompany eliminations, primarily relating to intercompany transactions between Power and PSE&G. No gains or losses are recorded on any intercompany transactions; rather, all intercompany transactions are priced in accordance with applicable regulations, including affiliate pricing rules, or at cost or, in the case of the BGS and BGSS contracts between Power and PSE&G, at rates prescribed by the BPU. For a further discussion of the intercompany transactions between Power and PSE&G, see Note 17. Related-Party Transactions.