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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure $ 7 $ 25
Financial and Nonfinancial Liabilities, Fair Value Disclosure (6) (12)
PSE&G [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure 0 13
Financial and Nonfinancial Liabilities, Fair Value Disclosure (5) (11)
Power [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure 7 12
Financial and Nonfinancial Liabilities, Fair Value Disclosure (1) (1)
Forward Contracts [Member] | PSE&G [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure 0 13
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ (5) $ (11)
Fair Value Measurements, Valuation Techniques Discounted Cash Flow Discounted Cash Flow
Fair Value Measurement With Significant Unobservable Inputs Transportation Costs Transportation Costs
Forward Contracts [Member] | Dekatherms [Member] | PSE&G [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Transportation Costs 0.60 0.60
Forward Contracts [Member] | Dekatherms [Member] | PSE&G [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Transportation Costs 0.80 0.80
Electric Load Contracts [Member] | Power [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure $ 7 $ 11
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ (1) $ (1)
Fair Value Measurements, Valuation Techniques Discounted Cash flow Discounted Cash Flow
Fair Value Measurement With Significant Unobservable Inputs Historic Load Variability Historic Load Variability
Electric Load Contracts [Member] | Power [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Historic Load Variability 0.00% 0.00%
Electric Load Contracts [Member] | Power [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Historic Load Variability 10.00% 10.00%
Various [Member] | Power [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure $ 0 [1] $ 1
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0 [1] $ 0
[1] Includes gas supply positions which were immaterial as of December 31, 2016.