Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Operating Revenues (Effective Portion)	$ 2,773	$ 2,641	$ 2,249	$ 3,223	$ 2,318	$ 2,554	$ 2,310	$ 2,786	$ 10,886		$ 9,968		$ 9,781
Amount of gain (loss) attributed to cash flow hedges reclassified from AOCI into Earnings (effective portion)									(389)		(402)		(423)
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)									12		(4)		28
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)									0		(1)		1
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)									(9)		12		70
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)									12		(4)		28
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)									0		(1)		1
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Operating Revenues (Effective Portion)	1,610	1,138	986	1,700	1,245	1,174	1,193	1,451	5,434		5,063		4,873
Amount of gain (loss) attributed to cash flow hedges reclassified from AOCI into Earnings (effective portion)									(122)		(116)		(132)
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)									(9)		13		70
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)									12		(4)		32
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)									0		(1)		1
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Operating Revenues (Effective Portion)									(9)		13		79
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)									12		(4)		32
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)									0		(1)		1
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Operating Revenues (Effective Portion)									(9)		13		79
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		0		(4)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)									0		0		0
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)									0		0		(9)
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		(4)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)									0		0		0
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion)									0		0		(9)
Interest Expense [Member] | PSEG [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)									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]
Amount of gain (loss) attributed to cash flow hedges reclassified from AOCI into Earnings (effective portion)									$ 0		$ (1)	[1]	$ 0	[1]

[1] Includes amounts for PSEG parent.