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Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Interest Expense $ (92) $ (98)
Operating Revenues 2,616 3,135
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
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) 0 17
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) 0 1
Interest Expense (22) (31)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) 0 0
Operating Revenues 1,313 1,725
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion) 0 17
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) 0 1
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion 0 17
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) 0 0
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) 0 1
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion 0 17
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) 0 0
Interest Expense [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) 3  
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) 0  
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
Interest Expense $ 0 0
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)   $ 0