Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
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	$ 12		$ (4)
Amount of Pre-Tax Gain (Loss) Reclassified from AOCI into Income, Effective Portion		20	(9)		12
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)		0	0		(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)		3	12		(4)
Amount of Pre-Tax Gain (Loss) Reclassified from AOCI into Income, Effective Portion		20	(9)		13
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)		0	0		(1)
Operating Revenues [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	12		(4)
Amount of Pre-Tax Gain (Loss) Reclassified from AOCI into Income, Effective Portion		20	(9)		13
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)		0	0		(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)		3	12		(4)
Amount of Pre-Tax Gain (Loss) Reclassified from AOCI into Income, Effective Portion		20	(9)		13
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)		0	0		(1)
Interest Expense [Member] | Interest Rate Swaps [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	0		0
Amount of Pre-Tax Gain (Loss) Reclassified from AOCI into Income, Effective Portion		0	0	[1]	1	[1]
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	[1]	$ 0	$ 0		$ 0

[1] Includes amounts for PSEG parent.