Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets		$ 162	$ 240
Derivative Contracts, Noncurrent Assets		91	77
Total Mark-to-Market Derivative Assets		253	317
Derivative Contracts, Current Liabilities		(70)	(132)
Derivative Contracts, Noncurrent Liabilities		(23)	(33)
Total Mark-to-Market Derivative (Liabilities)		(93)	(165)
Net Mark-to-Market Derivative Assets (Liabilities)		160	152
Net cash collateral received in connection with net derivative contracts		(58)	24
Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	147	207
Derivative Contracts, Noncurrent Assets	[1]	91	62
Total Mark-to-Market Derivative Assets	[1]	238	269
Derivative Contracts, Current Liabilities	[1]	(70)	(132)
Derivative Contracts, Noncurrent Liabilities	[1]	(16)	(33)
Total Mark-to-Market Derivative (Liabilities)	[1]	(86)	(165)
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	152	104
Power [Member] | Netting [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1],[2]	(268)	(408)
Derivative Contracts, Noncurrent Assets	[1],[2]	(193)	(109)
Total Mark-to-Market Derivative Assets	[1],[2]	(461)	(517)
Derivative Contracts, Current Liabilities	[1],[2]	241	436
Derivative Contracts, Noncurrent Liabilities	[1],[2]	162	105
Total Mark-to-Market Derivative (Liabilities)	[1],[2]	403	541
Net Mark-to-Market Derivative Assets (Liabilities)	[1],[2]	(58)	24
Power [Member] | Energy-Related Contracts [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	2	18
Derivative Contracts, Noncurrent Assets	[1]	0	0
Total Mark-to-Market Derivative Assets	[1]	2	18
Derivative Contracts, Current Liabilities	[1]	0	0
Derivative Contracts, Noncurrent Liabilities	[1]	0	0
Total Mark-to-Market Derivative (Liabilities)	[1]	0	0
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	2	18
PSE And G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets		4	18
Derivative Contracts, Noncurrent Assets		0	8
Derivative Contracts, Noncurrent Liabilities		(7)	0
PSEG [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	11	15
Derivative Contracts, Noncurrent Assets	[1]	0	7
Total Mark-to-Market Derivative Assets	[1]	11	22
Derivative Contracts, Current Liabilities	[1]	0	0
Derivative Contracts, Noncurrent Liabilities	[1]	0	0
Total Mark-to-Market Derivative (Liabilities)	[1]	0	0
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	11	22
Not Designated as Hedging Instrument [Member] | Power [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	413	597
Derivative Contracts, Noncurrent Assets	[1]	284	171
Total Mark-to-Market Derivative Assets	[1]	697	768
Derivative Contracts, Current Liabilities	[1]	(311)	(568)
Derivative Contracts, Noncurrent Liabilities	[1]	(178)	(138)
Total Mark-to-Market Derivative (Liabilities)	[1]	(489)	(706)
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	208	62
Not Designated as Hedging Instrument [Member] | PSE And G [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	4	18
Derivative Contracts, Noncurrent Assets	[1]	0	8
Total Mark-to-Market Derivative Assets	[1]	4	26
Derivative Contracts, Current Liabilities	[1]	0	0
Derivative Contracts, Noncurrent Liabilities	[1]	(7)	0
Total Mark-to-Market Derivative (Liabilities)	[1]	(7)	0
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	(3)	26
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		(32)	(4)
Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		(38)	(8)
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		5	32
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		$ 7	$ 4

[1] Substantially all of Power's and PSEG's derivative instruments are contracts subject to master netting agreements. Contracts not subject to master netting or similar agreements are immaterial and did not have any collateral posted or received as of September 30, 2015 and December 31, 2014. PSE&G does not have any derivative contracts subject to master netting or similar agreements.

[2] Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of collateral. All cash collateral received or posted that has been allocated to derivative positions, where the right of offset exists, has been offset on the Condensed Consolidated Balance Sheets. As of September 30, 2015 and December 31, 2014, net cash collateral (received) paid of $(58) million and $24 million, respectively, were netted against the corresponding net derivative contract positions. Of the $(58) million as of September 30, 2015, $(32) million and $(38) million of cash collateral were netted against current assets and noncurrent assets, respectively, and $5 million and $7 million were netted against current liabilities and noncurrent liabilities, respectively. Of the $24 million as of December 31, 2014, $(4) million and $(8) million were netted against current assets and noncurrent assets, respectively, and $32 million and $4 million were netted against current liabilities and noncurrent liabilities, respectively.