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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	$ (94)	$ (101)	$ (191)	$ (203)
Operating Revenues	2,249	2,310	5,472	5,096
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	0	(7)	0
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	1	(12)	7
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	0	(7)	0
Interest Expense	(29)	(29)	(61)	(59)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	0	0	0
Operating Revenues	986	1,193	2,686	2,644
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)	0	2	(12)	8
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	0	0
Interest Expense	0	(1)	0	(1)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	0	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)	1	0	(7)	0
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	0	0	0
Operating Revenues	0	2	(12)	8
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	0	(7)	0
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	0	0	0
Operating Revenues	$ 0	$ 2	$ (12)	$ 8