Fair Value Measurements (A Reconciliation Of The Beginning And Ending Balances Of Level 3 Derivative Contracts And Securities) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended		3 Months Ended								6 Months Ended				3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 PSEG (Parent) [Member]	Jun. 30, 2011 Power [Member]	Mar. 31, 2011 Power [Member]	Jun. 30, 2010 Power [Member]	Jun. 30, 2011 Net Derivative Assets [Member]		Jun. 30, 2010 Net Derivative Assets [Member]		Jun. 30, 2011 Net Derivative Assets [Member]		Jun. 30, 2010 Net Derivative Assets [Member]		Jun. 30, 2010 NDT Funds [Member]		Jun. 30, 2011 NDT Funds [Member]		Jun. 30, 2010 NDT Funds [Member]		Jun. 30, 2010 Rabbi Trust Funds [Member]		Jun. 30, 2010 Rabbi Trust Funds [Member]
Opening Balance									$ 2		$ 240		$ 47		$ 105		$ 13		$ 8		$ 9		$ 16		$ 14
Included in Income									(9)	[1]	(86)	[1]	(40)	[2]	28	[2]	0	[1]	0	[2]	0	[2]	0	[1]	0	[2]
Included in Regulatory Assets/Liabilities									6	[3]	0	[3]	(4)	[3]	45	[3]	0	[3]	0	[3]	0	[3]	0	[3]	0	[3]
Purchases, (Sales)									1	[4]			19	[4]					0	[4]
(Issuances) (Settlements)									(3)	[5]			(25)	[5]					0	[5]
Purchases, (Sales) and Settlements											14				(10)		(7)				(3)		0		2
Transfers In (Out)									0				0						(8)
Closing Balance	0		0						(3)		168		(3)		168		6		0		6		16		16
Gains and losses attributable to changes in net derivative assets and liabilities, included in Operating Income			(40)	(9)	(7)			(81)
Gains and losses attributable to changes in net derivative assets and liabilities included in OCI	(2)		(3)	14			(6)
Gains and losses attributable to changes in net derivative assets and liabilities included in Income from Discontinued Operations	1		3	23				1
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized	(24)	(78)	(56)	(23)
Gains and losses attributable to changes in net derivative assets and liabilities, realized			16	14		17		(3)
Purchases	37		55
Sales	(36)		(36)
Issuances	(9)		(20)
Settlements	$ 6		$ (5)

[1] PSEG's and Power's gains and losses are mainly attributable to changes in net derivative assets and liabilities of which $(7) million and $(81) are included in Operating Income, $(2) million and $(6) million are included in OCI, and less than $1 million and $1 million are included in Income from Discontinued Operations in 2011 and 2010, respectively. Of the $(7) million in Operating Income in 2011, $(24) million is unrealized and $17 million is realized. Of the $(81) million in Operating Income in 2010, $(78) million is unrealized and $(3) million is realized.

[2] PSEG's and Power's gains and losses are mainly attributable to changes in net derivative assets and liabilities of which $(40) million and $(9) million are included in Operating Income, $(3) million and $14 million are included in OCI, and $3 million and $23 million are included in Income from Discontinued Operations in 2011 and 2010, respectively. Of the $(40) million in Operating Income in 2011, $(56) million is unrealized and $16 million is realized. Of the $(9) million in Operating Income in 2010, $(23) million is unrealized and $14 million is realized.

[3] Mainly includes gains/losses on PSE&G's derivative contracts that are not included in either earnings or OCI, as they are deferred as a Regulatory Asset/Liability and are expected to be recovered from/returned to PSE&G's customers.

[4] Includes $37 million in purchases and $(36) million in sales for the three months ended June 30, 2011. Includes $55 million in purchases and $(36) in sales for the six months ended June 30, 2011.

[5] Includes $(9) million in issuances and $6 million in settlements for in the three months ended June 30, 2011. Includes $(20) million in issuances and $(5) million in settlements for the six months ended June 30, 2011.