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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	$ (100)	$ (100)	$ (291)	$ (303)
Operating Revenues	2,641	2,554	8,113	7,650
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)	3	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)	1	3	(11)	10
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)	3	1	(4)	1
Interest Expense	(31)	(26)	(92)	(85)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	(1)	0	(1)
Operating Revenues	1,138	1,174	3,824	3,818
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)	1	3	(11)	11
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	0
Interest Expense			0	(1)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)			0	0
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)	3	1	(4)	1
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	(1)	0	(1)
Operating Revenues	1	3	(11)	11
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)	3	1	(4)	1
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	(1)	0	(1)
Operating Revenues	$ 1	$ 3	$ (11)	$ 11