Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	$ 98	$ 138
Derivative Contracts, Noncurrent Assets	163	153
Total Mark-to-Market Derivative Assets	261	291
Derivative Contracts, Current Liabilities	(76)	(46)
Derivative Contracts, Noncurrent Liabilities	(31)	(122)
Total Mark-to-Market Derivative (Liabilities)	(107)	(168)
Net Mark-to-Market Derivative Assets (Liabilities)	154	123
Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	57	118	[1]
Derivative Contracts, Noncurrent Assets	72	49	[1]
Total Mark-to-Market Derivative Assets	129	167	[1]
Derivative Contracts, Current Liabilities	(76)	(46)	[1]
Derivative Contracts, Noncurrent Liabilities	(31)	(15)	[1]
Total Mark-to-Market Derivative (Liabilities)	(107)	(61)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	22	106	[1]
Power [Member] | Netting [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	(266)	(217)	[1],[2]
Derivative Contracts, Noncurrent Assets	(83)	(26)	[1],[2]
Total Mark-to-Market Derivative Assets	(349)	(243)	[1],[2]
Derivative Contracts, Current Liabilities	271	219	[1],[2]
Derivative Contracts, Noncurrent Liabilities	80	26	[1],[2]
Total Mark-to-Market Derivative (Liabilities)	351	245	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	2	2	[1],[2]
Power [Member] | Energy-Related Contracts [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	0	3	[1]
Derivative Contracts, Noncurrent Assets	0	0	[1]
Total Mark-to-Market Derivative Assets	0	3	[1]
Derivative Contracts, Current Liabilities	(4)	0	[1]
Derivative Contracts, Noncurrent Liabilities	0	0	[1]
Total Mark-to-Market Derivative (Liabilities)	(4)	0	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	(4)	3	[1]
PSE&G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	25	5
Derivative Contracts, Noncurrent Assets	69	62
Derivative Contracts, Noncurrent Liabilities	0	(107)
PSEG [Member] | Interest Rate Swaps [Member] | Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	16	15	[1]
Derivative Contracts, Noncurrent Assets	22	42	[1]
Total Mark-to-Market Derivative Assets	38	57	[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)	38	57	[1]
Not Designated as Hedging Instrument [Member] | Power [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	323	332	[1]
Derivative Contracts, Noncurrent Assets	155	75	[1]
Total Mark-to-Market Derivative Assets	478	407	[1]
Derivative Contracts, Current Liabilities	(343)	(265)	[1]
Derivative Contracts, Noncurrent Liabilities	(111)	(41)	[1]
Total Mark-to-Market Derivative (Liabilities)	(454)	(306)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	24	101	[1]
Not Designated as Hedging Instrument [Member] | PSE&G [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	25	5	[1]
Derivative Contracts, Noncurrent Assets	69	62	[1]
Total Mark-to-Market Derivative Assets	94	67	[1]
Derivative Contracts, Current Liabilities	0	0	[1]
Derivative Contracts, Noncurrent Liabilities	0	(107)	[1]
Total Mark-to-Market Derivative (Liabilities)	0	(107)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	$ 94	$ (40)	[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, 2013 and 2012. 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 Sheet. As of December 31, 2013 and 2012, net cash collateral paid of $2 million was netted against the corresponding net derivative contract positions. Of the $2 million as of December 31, 2013, $(3) million and $5 million were netted against noncurrent assets and current liabilities, respectively. Of the $2 million as of December 31, 2012, cash collateral of $(3) million and $5 million were netted against current assets and current liabilities, respectively.