Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 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)	$ 0	[1]	$ (8)	[1]	$ 0	[1]	$ 26	[1]
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	[1]	1	[1]	0	[1]	0	[1]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)	1	[1]	7	[1]	7	[1]	42	[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)	0		(8)		0		26
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0		1		0		0
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)	2		8		8		43
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)	0	[1]	(8)	[1]	0	[1]	30	[1]
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	[1]	1	[1]	0	[1]	0	[1]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Operating Revenues (Effective Portion)	2	[1]	13	[1]	8	[1]	52	[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)	0		(8)		0		30
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0		1		0		0
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Operating Revenues (Effective Portion)	2		13		8		52
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]	0	[1]	0	[1]	(4)	[1]
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	[1]	0	[1]	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]	(5)	[1]	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		0		0		(4)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0		0		0		0
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)	0		(5)		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]	0	[1]	0	[1]
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	[1]	0	[1]	0	[1]	0	[1]
Cash Flow Hedge Gain (Loss) Reclassified to Interest Expense, Net	$ (1)	[1]	$ (1)	[1]	$ (1)	[1]	$ (1)	[1]

[1] Includes amounts for PSEG parent.