Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	$ (98)	$ (97)
Operating Revenues	3,135	3,223
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	(8)
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)	17	(12)
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	(8)
Interest Expense	(31)	(32)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	0
Operating Revenues	1,725	1,700
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)	17	(12)
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	(8)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	0
Operating Revenues	17	(12)
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	(8)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	0
Operating Revenues	$ 17	$ (12)