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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, Fair Value $ 7   $ 7
Liabilities, Fair Value (3)   (6)
PSEG Power [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, Fair Value 7   7
Liabilities, Fair Value (3)   (6)
Electric Load Contracts [Member] | PSEG Power [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, Fair Value 7   2
Liabilities, Fair Value $ 0   $ (5)
Valuation Technique used Discounted Cash flow   Discounted Cash flow
Significant Unobservable Inputs Historic Load Variability Historic Load Variability  
Electric Load Contracts [Member] | Minimum [Member] | PSEG Power [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Historic Load Variability 0.00%   0.00%
Electric Load Contracts [Member] | Maximum [Member] | PSEG Power [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Historic Load Variability 15.00%   15.00%
Gas Physical Contract [Member] | PSEG Power [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, Fair Value $ 0   $ 5
Liabilities, Fair Value $ (3)   $ (1)
Valuation Technique used Discounted Cash flow   Discounted Cash flow
Significant Unobservable Inputs Average Historical Basis   Average Historical Basis
Gas Physical Contract [Member] | Minimum [Member] | PSEG Power [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Average Historical Basis (40.00%)   (40.00%)
Gas Physical Contract [Member] | Maximum [Member] | PSEG Power [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Average Historical Basis 0.00%   0.00%