Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	$ 240	$ 98
Derivative Contracts, Noncurrent Assets	77	163
Total Mark-to-Market Derivative Assets	317	261
Derivative Contracts, Current Liabilities	(132)	(76)
Derivative Contracts, Noncurrent Liabilities	(33)	(31)
Total Mark-to-Market Derivative (Liabilities)	(165)	(107)
Net Mark-to-Market Derivative Assets (Liabilities)	152	154
Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	207	57	[1]
Derivative Contracts, Noncurrent Assets	62	72	[1]
Total Mark-to-Market Derivative Assets	269	129	[1]
Derivative Contracts, Current Liabilities	(132)	(76)	[1]
Derivative Contracts, Noncurrent Liabilities	(33)	(31)	[1]
Total Mark-to-Market Derivative (Liabilities)	(165)	(107)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	104	22	[1]
Power [Member] | Netting [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	(408)	(266)	[1],[2]
Derivative Contracts, Noncurrent Assets	(109)	(83)	[1],[2]
Total Mark-to-Market Derivative Assets	(517)	(349)	[1],[2]
Derivative Contracts, Current Liabilities	436	271	[1],[2]
Derivative Contracts, Noncurrent Liabilities	105	80	[1],[2]
Total Mark-to-Market Derivative (Liabilities)	541	351	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	24	2	[1],[2]
Power [Member] | Energy-Related Contracts [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	18	0	[1]
Derivative Contracts, Noncurrent Assets	0	0	[1]
Total Mark-to-Market Derivative Assets	18	0	[1]
Derivative Contracts, Current Liabilities	0	(4)	[1]
Derivative Contracts, Noncurrent Liabilities	0	0	[1]
Total Mark-to-Market Derivative (Liabilities)	0	(4)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	18	(4)	[1]
PSE&G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	18	25
Derivative Contracts, Noncurrent Assets	8	69
PSEG [Member] | Interest Rate Swaps [Member] | Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	15	16	[1]
Derivative Contracts, Noncurrent Assets	7	22	[1]
Total Mark-to-Market Derivative Assets	22	38	[1]
Derivative Contracts, Current Liabilities	0	0	[1]
Derivative Contracts, Noncurrent Liabilities	0	0	[1]
Total Mark-to-Market Derivative (Liabilities)	0	0	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	22	38	[1]
Not Designated as Hedging Instrument [Member] | Power [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	597	323	[1]
Derivative Contracts, Noncurrent Assets	171	155	[1]
Total Mark-to-Market Derivative Assets	768	478	[1]
Derivative Contracts, Current Liabilities	(568)	(343)	[1]
Derivative Contracts, Noncurrent Liabilities	(138)	(111)	[1]
Total Mark-to-Market Derivative (Liabilities)	(706)	(454)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	62	24	[1]
Not Designated as Hedging Instrument [Member] | PSE&G [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	18	25	[1]
Derivative Contracts, Noncurrent Assets	8	69	[1]
Total Mark-to-Market Derivative Assets	26	94	[1]
Derivative Contracts, Current Liabilities	0	0	[1]
Derivative Contracts, Noncurrent Liabilities	0	0	[1]
Total Mark-to-Market Derivative (Liabilities)	0	0	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	$ 26	$ 94	[1]

[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 December 31, 2014 and 2013. 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 in the Consolidated Balance Sheets. As of December 31, 2014 and 2013, net cash collateral paid of $24 million and $2 million, respectively, were netted against the corresponding net derivative contract positions. 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. Of the $2 million as of December 31, 2013, cash collateral of $(3) million and $5 million were netted against noncurrent assets and current liabilities, respectively.