Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	$ 202		$ 156
Derivative Contracts, Noncurrent Assets	131		106
Total Mark-to-Market Derivative Assets	333		262
Derivative Contracts, Current Liabilities	(154)		(131)
Derivative Contracts, Noncurrent Liabilities	(20)		(26)
Total Mark-to-Market Derivative (Liabilities)	(174)		(157)
Net Mark-to-Market Derivative Assets (Liabilities)	159		105
Amount of fair value netting attributed to same counterparty and application of collateral received	(350)		(285)
Net cash collateral received in connection with net derivative contracts	48		82
PSEG [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Liabilities	(50)		(50)
Amount of fair value netting attributed to same counterparty and application of collateral received	(189)		(149)
PSE And G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Noncurrent Assets	34		4
Derivative Contracts, Current Liabilities	(2)		(7)
Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	186		139
Derivative Contracts, Noncurrent Assets	51		55
Total Mark-to-Market Derivative Assets	237		194
Derivative Contracts, Current Liabilities	(152)		(124)
Derivative Contracts, Noncurrent Liabilities	(18)		(24)
Total Mark-to-Market Derivative (Liabilities)	(170)		(148)
Net Mark-to-Market Derivative Assets (Liabilities)	67		46
Cash Flow Hedging [Member] | Energy-Related Contracts [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	52		55
Derivative Contracts, Noncurrent Assets	8		8
Total Mark-to-Market Derivative Assets	60		63
Derivative Contracts, Current Liabilities	(5)		(5)
Derivative Contracts, Noncurrent Liabilities	(1)		(1)
Total Mark-to-Market Derivative (Liabilities)	(6)		(6)
Net Mark-to-Market Derivative Assets (Liabilities)	54		57
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | PSEG [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	16		17
Derivative Contracts, Noncurrent Assets	46		47
Total Mark-to-Market Derivative Assets	62		64
Derivative Contracts, Current Liabilities	0		0
Derivative Contracts, Noncurrent Liabilities	(2)		(2)
Total Mark-to-Market Derivative (Liabilities)	(2)		(2)
Net Mark-to-Market Derivative Assets (Liabilities)	60		62
Netting [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	(510)	[1]	(448)	[1]
Derivative Contracts, Noncurrent Assets	(104)	[1]	(74)	[1]
Total Mark-to-Market Derivative Assets	(614)	[1]	(522)	[1]
Derivative Contracts, Current Liabilities	455	[1]	387	[1]
Derivative Contracts, Noncurrent Liabilities	111	[1]	53	[1]
Total Mark-to-Market Derivative (Liabilities)	566	[1]	440	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	(48)	[1]	(82)	[1]
Not Designated as Hedging Instrument [Member] | Energy-Related Contracts [Member] | PSE And G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	0		0
Derivative Contracts, Noncurrent Assets	34		4
Total Mark-to-Market Derivative Assets	34		4
Derivative Contracts, Current Liabilities	(2)		(7)
Derivative Contracts, Noncurrent Liabilities	0		0
Total Mark-to-Market Derivative (Liabilities)	(2)		(7)
Net Mark-to-Market Derivative Assets (Liabilities)	32		(3)
Not Designated as Hedging Instrument [Member] | Energy-Related Contracts [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	644		532
Derivative Contracts, Noncurrent Assets	147		121
Total Mark-to-Market Derivative Assets	791		653
Derivative Contracts, Current Liabilities	(602)		(506)
Derivative Contracts, Noncurrent Liabilities	(128)		(76)
Total Mark-to-Market Derivative (Liabilities)	(730)		(582)
Net Mark-to-Market Derivative Assets (Liabilities)	61		71
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	(79)		(77)
Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	(9)		(23)
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	24		16
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	$ 16		$ 2

[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 March 31, 2012 and December 31, 2011, net cash collateral received of $48 million and $82 million, respectively, was netted against the corresponding net derivative contract positions. Of the $48 million as of March 31, 2012, cash collateral of $(79) million and $(9) million were netted against current assets and noncurrent assets, respectively, and cash collateral of $24 million and $16 million were netted against current liabilities and noncurrent liabilities, respectively. 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.