Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
PSEG [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion)	$ 1	[1]	$ (3)	[1]	$ 1	[1]	$ 23	[1]
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	(1)	[1]	(1)	[1]	(1)	[1]	(1)	[1]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)	3	[1]	15	[1]	10	[1]	57	[1]
Power [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion)	1		(3)		1		23
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	(1)		(1)		(1)		(1)
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)	3		15		11		58
Operating Revenues [Member] | PSEG [Member] | Energy-Related Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion)	1	[1]	(3)	[1]	1	[1]	27	[1]
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	(1)	[1]	(1)	[1]	(1)	[1]	(1)	[1]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Operating Revenues (Effective Portion)	3	[1]	15	[1]	11	[1]	67	[1]
Operating Revenues [Member] | Power [Member] | Energy-Related Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion)	1		(3)		1		27
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	(1)		(1)		(1)		(1)
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Operating Revenues (Effective Portion)	3		15		11		67
Energy Costs [Member] | PSEG [Member] | Energy-Related Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion)					0	[1]	(4)	[1]
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)					0	[1]	0	[1]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)					0	[1]	(9)	[1]
Energy Costs [Member] | Power [Member] | Energy-Related Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion)					0		(4)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)					0		0
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)					0		(9)
Interest Expense [Member] | PSEG [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion)					0	[1]	0	[1]
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)					0	[1]	0	[1]
Cash Flow Hedge Gain (Loss) Reclassified to Interest Expense, Net					$ (1)	[1]	$ (1)	[1]

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