Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	$ 43	[1]	$ 98
Derivative Contracts, Noncurrent Assets	47	[1]	163
Total Mark-to-Market Derivative Assets	90	[1]	261
Derivative Contracts, Current Liabilities	(75)	[1]	(76)
Derivative Contracts, Noncurrent Liabilities	(28)	[1]	(31)
Total Mark-to-Market Derivative (Liabilities)	(103)	[1]	(107)
Net Mark-to-Market Derivative Assets (Liabilities)	(13)	[1]	154
Net cash collateral received in connection with net derivative contracts	116		2
Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	27	[1]	57	[1]
Derivative Contracts, Noncurrent Assets	9	[1]	72	[1]
Total Mark-to-Market Derivative Assets	36	[1]	129	[1]
Derivative Contracts, Current Liabilities	(67)	[1]	(76)	[1]
Derivative Contracts, Noncurrent Liabilities	(28)	[1]	(31)	[1]
Total Mark-to-Market Derivative (Liabilities)	(95)	[1]	(107)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	(59)	[1]	22	[1]
Power [Member] | Netting [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	(579)		(266)	[1],[2]
Derivative Contracts, Noncurrent Assets	(128)		(83)	[1],[2]
Total Mark-to-Market Derivative Assets	(707)	[2]	(349)	[1],[2]
Derivative Contracts, Current Liabilities	726		271	[1],[2]
Derivative Contracts, Noncurrent Liabilities	97		80	[1],[2]
Total Mark-to-Market Derivative (Liabilities)	823	[2]	351	[1],[2]
Net Mark-to-Market Derivative Assets (Liabilities)	116	[2]	2	[1],[2]
Power [Member] | Energy-Related Contracts [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	0		0	[1]
Derivative Contracts, Noncurrent Assets	0		0	[1]
Derivative Contracts, Current Liabilities	0		(4)	[1]
Derivative Contracts, Noncurrent Liabilities	0		0	[1]
Power [Member] | Energy-Related Contracts [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Total Mark-to-Market Derivative Assets	0		0	[1]
Total Mark-to-Market Derivative (Liabilities)	0		(4)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	0		(4)	[1]
PSE And G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	0		25
Derivative Contracts, Noncurrent Assets	20		69
Derivative Contracts, Current Liabilities	(8)		0
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	18		22	[1]
Total Mark-to-Market Derivative Assets	34	[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)	34	[1]	38	[1]
Not Designated as Hedging Instrument [Member] | Power [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	606		323	[1]
Derivative Contracts, Noncurrent Assets	137		155	[1]
Derivative Contracts, Current Liabilities	(793)		(343)	[1]
Derivative Contracts, Noncurrent Liabilities	(125)		(111)	[1]
Not Designated as Hedging Instrument [Member] | Power [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Total Mark-to-Market Derivative Assets	743		478	[1]
Total Mark-to-Market Derivative (Liabilities)	(918)		(454)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	(175)		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	0		25	[1]
Derivative Contracts, Noncurrent Assets	20		69	[1]
Derivative Contracts, Current Liabilities	(8)		0	[1]
Derivative Contracts, Noncurrent Liabilities	0		0	[1]
Not Designated as Hedging Instrument [Member] | PSE And G [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Total Mark-to-Market Derivative Assets	20	[1]	94	[1]
Total Mark-to-Market Derivative (Liabilities)	(8)	[1]	0	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	12	[1]	94	[1]
Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	(33)		(3)
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	147		5
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	$ 2

[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 March 31, 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 statement of financial position. As of March 31, 2014 and December 31, 2013, net cash collateral (received) paid of $116 million and $2 million, respectively, were netted against the corresponding net derivative contract positions. Of the $116 million as of March 31, 2014, $(33) million of cash collateral was netted against noncurrent assets and $147 million and $2 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.