Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheet) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Derivative Assets, Current	$ 135	$ 182
Derivative Assets, Noncurrent	63	79
Derivative Assets	198	261
Derivative Liabilities, Current	(67)	(103)
Derivative Liabilities, Noncurrent	(21)	(22)
Derivative Liabilities	(88)	(125)
Net mark-to-market derivative assets (liabilities)	110	136
Net cash collateral received in connection with net derivative contracts	2	61
Power [Member] \| Current Assets [Member]
Fair value of derivatives designated cash flow hedges, current assets	103	204
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	294	403
Amount of fair value netting attributed to same counterparty and application of collateral received	(282)	(444)
Derivative Assets, Current	115	163
PSE&G [Member] \| Current Assets [Member]
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	0	0
PSEG [Member] \| Current Assets [Member]
Fair value of derivatives designated cash flow hedges, current assets	20	19
Current Assets [Member]
Derivative Assets, Current	135	182
Net cash collateral received in connection with net derivative contracts	(1)	(132)
Power [Member] \| Noncurrent Assets [Member]
Fair value of derivatives designated cash flow hedges, current assets	6	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	(24)	(41)
Derivative Assets, Noncurrent	26	42
PSE&G [Member] \| Noncurrent Assets [Member]
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	10	17
PSEG [Member] \| Noncurrent Assets [Member]
Fair value of derivatives designated cash flow hedges, current assets	27	20
Noncurrent Assets [Member]
Derivative Assets, Noncurrent	63	79
Net cash collateral received in connection with net derivative contracts	(1)	(3)
Power [Member] \| Current Liabilities [Member]
Fair value of derivatives designated cash flow hedges, current liabilities	(5)	(11)
Fair value of derivates not designated as hedges, current liabilities	(334)	(454)
Amount of fair value netting attributed to same counterparty and application of collateral received, attributed to current liabilities	281	374
Derivative Liabilities, Current	(58)	(91)
PSE&G [Member] \| Current Liabilities [Member]
Fair value of derivatives designated cash flow hedges, current liabilities		(12)
Fair value of derivates not designated as hedges, current liabilities	(9)
PSEG [Member] \| Current Liabilities [Member]
Fair value of derivatives designated cash flow hedges, current liabilities	0	0
Current Liabilities [Member]
Derivative Liabilities, Current	(67)	(103)
Net cash collateral received in connection with net derivative contracts		62
Power [Member] \| Noncurrent Liabilities [Member]
Fair value of derivatives designated cash flow hedges, current liabilities	(3)	0
Fair value of derivates 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	23	50
Derivative Liabilities, Noncurrent	(21)	(22)
PSE&G [Member] \| Noncurrent Liabilities [Member]
Fair value of derivatives designated cash flow hedges, current liabilities		0
Fair value of derivates not designated as hedges, current liabilities	0
PSEG [Member] \| Noncurrent Liabilities [Member]
Fair value of derivatives designated cash flow hedges, current liabilities	0	0
Noncurrent Liabilities [Member]
Derivative Liabilities, Noncurrent	(21)	(22)
Net cash collateral received in connection with net derivative contracts		12
Power [Member]
Fair value of derivatives designated cash flow hedges, current assets	109	207
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	338	483
Amount of fair value netting attributed to same counterparty and application of collateral received	(306)	(485)
Derivative Assets, Current	115	163
Derivative Assets, Noncurrent	26	42
Derivative Assets	141	205
Fair value of derivatives designated cash flow hedges, current liabilities	(8)	(11)
Fair value of derivates not designated as hedges, current liabilities	(375)	(526)
Amount of fair value netting attributed to same counterparty and application of collateral received, attributed to current liabilities	304	424
Derivative Liabilities, Current	(58)	(91)
Derivative Liabilities, Noncurrent	(21)	(22)
Derivative Liabilities	(79)	(113)
Net mark-to-market derivative assets (liabilities) attributed to cash flow hedges	101	196
Net mark-to-market derivative assets (liabilities) attributed to non cash flow hedges	(37)	(43)
Amount of fair value netting attributed to same counterparty and application of collateral received, attributed to net mark-to-market derivative assets (liabilities)	(2)	(61)
Net mark-to-market derivative assets (liabilities)	62	92
PSE&G [Member]
Fair value amount of derivative contracts that do not qualify for cash flow hedge accounting	10	17
Derivative Assets, Noncurrent	10	17
Fair value of derivatives designated cash flow hedges, current liabilities		(12)
Fair value of derivates not designated as hedges, current liabilities	(9)
Derivative Liabilities, Current	(9)	(12)
Net mark-to-market derivative assets (liabilities) attributed to non cash flow hedges	1	5
PSEG [Member]
Fair value of derivatives designated cash flow hedges, current assets	47	39
Fair value of derivatives designated cash flow hedges, current liabilities	0	0
Net mark-to-market derivative assets (liabilities)	$ 47	$ 39

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