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

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