Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheet) (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	$ 113		$ 182
Derivative Assets, Noncurrent	75		79
Derivative Assets	188		261
Derivative Liabilities, Current	(94)		(103)
Derivative Liabilities, Noncurrent	(31)		(22)
Derivative Liabilities	(125)		(125)
Net mark-to-market derivative assets (liabilities)	63		136
Net cash collateral received in connection with net derivative contracts	10		61
Power [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	76		204
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	232		403
Amount of fair value netting attributed to same counterparty and application of collateral received	(213)	[1]	(444)	[1]
Derivative Assets, Current	95		163
PSE&G [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	0		0
PSEG [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	18		19
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	113		182
Net cash collateral received in connection with net derivative contracts	(9)		(132)
Power [Member] | Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	7		3
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	44		80
Amount of fair value netting attributed to same counterparty and application of collateral received	(27)	[1]	(41)	[1]
Derivative Assets, Noncurrent	24		42
PSE&G [Member] | Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	0		17
PSEG [Member] | Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	51		20
Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Noncurrent	75		79
Net cash collateral received in connection with net derivative contracts	(1)		(3)
Power [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current liabilities	(2)		(11)
Fair value of derivatives not designated as hedges, current liabilities	(281)		(454)
Amount of fair value netting attributed to same counterparty and application of collateral received, attributed to current liabilities	204	[1]	374	[1]
Derivative Liabilities, Current	(79)		(91)
PSE&G [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives not designated as hedges, current liabilities	(15)		(12)
PSEG [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current liabilities	0		0
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current	(94)		(103)
Net cash collateral received in connection with net derivative contracts			62
Power [Member] | Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current liabilities	(2)		0
Fair value of derivatives not designated as hedges, current liabilities	(41)		(72)
Amount of fair value netting attributed to same counterparty and application of collateral received, attributed to current liabilities	26	[1]	50	[1]
Derivative Liabilities, Noncurrent	(17)		(22)
PSE&G [Member] | Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives not designated as hedges, current liabilities	(11)		0
PSEG [Member] | Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current liabilities	(3)		0
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Noncurrent	(31)		(22)
Net cash collateral received in connection with net derivative contracts			12
Power [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	83		207
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	276		483
Amount of fair value netting attributed to same counterparty and application of collateral received	(240)	[1]	(485)	[1]
Derivative Assets, Current	95		163
Derivative Assets, Noncurrent	24		42
Derivative Assets	119		205
Fair value of derivatives designated cash flow hedges, current liabilities	(4)		(11)
Fair value of derivatives not designated as hedges, current liabilities	(322)		(526)
Amount of fair value netting attributed to same counterparty and application of collateral received, attributed to current liabilities	230	[1]	424	[1]
Derivative Liabilities, Current	(79)		(91)
Derivative Liabilities, Noncurrent	(17)		(22)
Derivative Liabilities	(96)		(113)
Net mark-to-market derivative assets (liabilities) attributed to cash flow hedges	79		196
Net mark-to-market derivative assets (liabilities) attributed to non cash flow hedges	(46)		(43)
Amount of fair value netting attributed to same counterparty and application of collateral received, attributed to net mark-to-market derivative assets (liabilities)	(10)	[1]	(61)	[1]
Net mark-to-market derivative assets (liabilities)	23		92
PSE&G [Member]
Derivatives, Fair Value [Line Items]
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	0		17
Derivative Assets, Noncurrent	0		17
Fair value of derivatives not designated as hedges, current liabilities	(26)		(12)
Derivative Liabilities, Current	(15)		(12)
Derivative Liabilities, Noncurrent	(11)		0
Net mark-to-market derivative assets (liabilities) attributed to non cash flow hedges	(26)		5
PSEG [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	69		39
Fair value of derivatives designated cash flow hedges, current liabilities	(3)		0
Net mark-to-market derivative assets (liabilities)	$ 66		$ 39

[1] Represents the netting of fair value balances with the same counterparty and the application of collateral. As of September 30, 2011 and December 31, 2010, net cash collateral received of $10 million and $61 million, respectively, was netted against the corresponding net derivative contract positions. Of the $10 million as of September 30, 2011, cash collateral of $(9) million and $(1) million were netted against current assets and noncurrent assets, respectively. Of the $61 million as of December 31, 2010, cash collateral of $(132) million and $(3) million were netted against current assets and noncurrent assets, respectively, and cash collateral of $62 million and $12 million were netted against current liabilities and noncurrent liabilities, respectively.