Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Amount of fair value netting attributed to same counterparty and application of collateral received	$ (285)		$ (226)
Derivative Assets, Current	156		182
Derivative Assets, Noncurrent	106		79
Derivative Assets	262		261
Derivative Liabilities, Current	(131)		(103)
Derivative Liabilities, Noncurrent	(26)		(22)
Derivative Liabilities	(157)		(125)
Net mark-to-market derivative assets (liabilities)	105		136
Net cash collateral received in connection with net derivative contracts	82		61
PSEG [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	64		39
Amount of fair value netting attributed to same counterparty and application of collateral received	(149)		(110)
Fair value of derivatives designated cash flow hedges, current liabilities	(2)		0
Derivative Liabilities, Current	(50)
Net mark-to-market derivative assets (liabilities)	62		39
PSE&G [Member]
Derivatives, Fair Value [Line Items]
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	4		17
Derivative Assets, Noncurrent	4		17
Fair value of derivatives not designated as hedges, current liabilities	(7)		(12)
Derivative Liabilities, Current	(7)		(12)
Net mark-to-market derivative assets (liabilities) attributed to non cash flow hedges	(3)		5
Power [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	63		207
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	653		483
Amount of fair value netting attributed to same counterparty and application of collateral received	(522)	[1]	(485)	[1]
Derivative Assets, Current	139		163
Derivative Assets, Noncurrent	55		42
Derivative Assets	194		205
Fair value of derivatives designated cash flow hedges, current liabilities	(6)		(11)
Fair value of derivatives not designated as hedges, current liabilities	(582)		(526)
Amount of fair value netting attributed to same counterparty and application of collateral received, attributed to current liabilities	440	[1]	424	[1]
Derivative Liabilities, Current	(124)		(91)
Derivative Liabilities, Noncurrent	(24)		(22)
Derivative Liabilities	(148)		(113)
Net mark-to-market derivative assets (liabilities) attributed to cash flow hedges	57		196
Net mark-to-market derivative assets (liabilities) attributed to non cash flow hedges	71		(43)
Amount of fair value netting attributed to same counterparty and application of collateral received, attributed to net mark-to-market derivative assets (liabilities)	(82)	[1]	(61)	[1]
Net mark-to-market derivative assets (liabilities)	46		92
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	156		182
Net cash collateral received in connection with net derivative contracts	(77)		(132)
Current Assets [Member] | PSEG [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	17		19
Current Assets [Member] | PSE&G [Member]
Derivatives, Fair Value [Line Items]
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	0		0
Current Assets [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	55		204
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	532		403
Amount of fair value netting attributed to same counterparty and application of collateral received	(448)	[1]	(444)	[1]
Derivative Assets, Current	139		163
Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Noncurrent	106		79
Net cash collateral received in connection with net derivative contracts	(23)		(3)
Noncurrent Assets [Member] | PSEG [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	47		20
Noncurrent Assets [Member] | PSE&G [Member]
Derivatives, Fair Value [Line Items]
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	4		17
Noncurrent Assets [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current assets	8		3
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	121		80
Amount of fair value netting attributed to same counterparty and application of collateral received	(74)	[1]	(41)	[1]
Derivative Assets, Noncurrent	55		42
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current	(131)		(103)
Net cash collateral received in connection with net derivative contracts	16		62
Current Liabilities [Member] | PSEG [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current liabilities	0		0
Current Liabilities [Member] | PSE&G [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives not designated as hedges, current liabilities	(7)		(12)
Current Liabilities [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current liabilities	(5)		(11)
Fair value of derivatives not designated as hedges, current liabilities	(506)		(454)
Amount of fair value netting attributed to same counterparty and application of collateral received, attributed to current liabilities	387	[1]	374	[1]
Derivative Liabilities, Current	(124)		(91)
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Noncurrent	(26)		(22)
Net cash collateral received in connection with net derivative contracts	2		12
Noncurrent Liabilities [Member] | PSEG [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current liabilities	(2)		0
Noncurrent Liabilities [Member] | PSE&G [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives not designated as hedges, current liabilities	0		0
Noncurrent Liabilities [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivatives designated cash flow hedges, current liabilities	(1)		0
Fair value of derivatives not designated as hedges, current liabilities	(76)		(72)
Amount of fair value netting attributed to same counterparty and application of collateral received, attributed to current liabilities	53	[1]	50	[1]
Derivative Liabilities, Noncurrent	$ (24)		$ (22)

[1] Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of collateral. As of December 31, 2011 and December 31, 2010, net cash collateral received of $82 million and $61 million, respectively, was netted against the corresponding net derivative contract positions. Of the $82 million as of December 31, 2011, cash collateral of $(77) million and $(23) million were netted against current assets and noncurrent assets, respectively, and cash collateral of $16 million and $2 million were netted against current liabilities and noncurrent liabilities, 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.