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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Power [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value $ 0 $ 4
Liabilities, Fair Value (21) (10)
PSE And G [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value 13 94
Liabilities, Fair Value 0 0
PSEG [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value 13 98
Liabilities, Fair Value (21) (10)
Electric Swaps [Member] | Power [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value   3
Liabilities, Fair Value   (1)
Valuation Technique (s)   Discounted Cash Flow
Significant Unobservable Inputs   Power Basis
Electric Load Contracts [Member] | Power [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value 0 0
Liabilities, Fair Value (21) (8)
Valuation Technique (s) Discounted Cash Flow Discounted Cash Flow
Significant Unobservable Inputs Historic Load Variability Historic Load Variability
Various [Member] | Power [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value 0 [1] 1 [2]
Liabilities, Fair Value 0 [1] (1) [2]
Forward Contracts [Member] | PSE And G [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value 13 94
Liabilities, Fair Value $ 0 $ 0
Valuation Technique (s) Discounted Cash Flow Discounted Cash Flow
Significant Unobservable Inputs Transportation Costs Transportation Costs
Minimum [Member] | Electric Load Contracts [Member] | Power [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Historic Load Variability 0.00% (5.00%)
Minimum [Member] | MWh [Member] | Electric Swaps [Member] | Power [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Power Basis Range   0
Minimum [Member] | MWh [Member] | Forward Contracts [Member] | PSE And G [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transportation Costs 0.70 0.70
Maximum [Member] | Electric Load Contracts [Member] | Power [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Historic Load Variability 10.00% 10.00%
Maximum [Member] | MWh [Member] | Electric Swaps [Member] | Power [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Power Basis Range   10
Maximum [Member] | MWh [Member] | Forward Contracts [Member] | PSE And G [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transportation Costs 1 1
[1] Includes gas supply positions and long-term electric capacity positions which were immaterial as of September 30, 2014.
[2] Includes gas supply positions which were immaterial as of December 31, 2013.