Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	$ 71	[1]	$ 98
Derivative Contracts, Noncurrent Assets	29	[1]	163
Total Mark-to-Market Derivative Assets	100	[1]	261
Derivative Contracts, Current Liabilities	(109)	[1]	(76)
Derivative Contracts, Noncurrent Liabilities	(37)	[1]	(31)
Total Mark-to-Market Derivative (Liabilities)	(146)	[1]	(107)
Net Mark-to-Market Derivative Assets (Liabilities)	(46)	[1]	154
Net cash collateral received in connection with net derivative contracts	106		2
Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	50	[1]	57	[1]
Derivative Contracts, Noncurrent Assets	11	[1]	72	[1]
Total Mark-to-Market Derivative Assets	61	[1]	129	[1]
Derivative Contracts, Current Liabilities	(109)	[1]	(76)	[1]
Derivative Contracts, Noncurrent Liabilities	(37)	[1]	(31)	[1]
Total Mark-to-Market Derivative (Liabilities)	(146)	[1]	(107)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	(85)	[1]	22	[1]
Power [Member] | Netting [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	(471)		(266)	[1],[2]
Derivative Contracts, Noncurrent Assets	(155)		(83)	[1],[2]
Total Mark-to-Market Derivative Assets	(626)	[2]	(349)	[1],[2]
Derivative Contracts, Current Liabilities	594		271	[1],[2]
Derivative Contracts, Noncurrent Liabilities	138		80	[1],[2]
Total Mark-to-Market Derivative (Liabilities)	732	[2]	351	[1],[2]
Net Mark-to-Market Derivative Assets (Liabilities)	106	[2]	2	[1],[2]
Power [Member] | Energy-Related Contracts [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	4		0	[1]
Derivative Contracts, Noncurrent Assets	0		0	[1]
Total Mark-to-Market Derivative Assets	4		0	[1]
Derivative Contracts, Current Liabilities	(1)		(4)	[1]
Derivative Contracts, Noncurrent Liabilities	0		0	[1]
Total Mark-to-Market Derivative (Liabilities)	(1)		(4)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	3		(4)	[1]
PSE And G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	5		25
Derivative Contracts, Noncurrent Assets	8		69
PSEG [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	16		16	[1]
Derivative Contracts, Noncurrent Assets	10		22	[1]
Total Mark-to-Market Derivative Assets	26	[1]	38	[1]
Derivative Contracts, Current Liabilities	0		0	[1]
Derivative Contracts, Noncurrent Liabilities	0		0	[1]
Total Mark-to-Market Derivative (Liabilities)	0	[1]	0	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	26	[1]	38	[1]
Not Designated as Hedging Instrument [Member] | Power [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	517		323	[1]
Derivative Contracts, Noncurrent Assets	166		155	[1]
Total Mark-to-Market Derivative Assets	683		478	[1]
Derivative Contracts, Current Liabilities	(702)		(343)	[1]
Derivative Contracts, Noncurrent Liabilities	(175)		(111)	[1]
Total Mark-to-Market Derivative (Liabilities)	(877)		(454)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	(194)		24	[1]
Not Designated as Hedging Instrument [Member] | PSE And G [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	5		25	[1]
Derivative Contracts, Noncurrent Assets	8		69	[1]
Total Mark-to-Market Derivative Assets	13	[1]	94	[1]
Derivative Contracts, Current Liabilities	0		0	[1]
Derivative Contracts, Noncurrent Liabilities	0		0	[1]
Total Mark-to-Market Derivative (Liabilities)	0	[1]	0	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	13	[1]	94	[1]
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	(12)
Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	(21)		(3)
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	135		5
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	$ 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, 2014 and December 31, 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 Condensed Consolidated Balance Sheets. As of September 30, 2014 and December 31, 2013, net cash collateral (received) paid of $106 million and $2 million, respectively, were netted against the corresponding net derivative contract positions. Of the $106 million as of September 30, 2014, $(12) million and $(21) million of cash collateral was netted against current assets and noncurrent assets, respectively, and $135 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.