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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, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value | $ 21 |  | $ 10
Liabilities, Fair Value | (2) |  | (3)
PSEG Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value | 21 |  | 10
Liabilities, Fair Value | (2) |  | (3)
Electric Load Contracts [Member] | PSEG Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value | 21 |  | 10
Liabilities, Fair Value | $ 0 |  | $ 0
Valuation Technique used | Discounted Cash flow | Discounted Cash flow |
Significant Unobservable Inputs | Load Shaping Cost | Historic Load Variability |
Historic Load Variability | 3.00% |  |
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 | 10.00% |  | 10.00%
Gas Physical Contract [Member] | PSEG Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value | $ 0 |  | $ 0
Liabilities, Fair Value | $ (2) |  | $ (3)
Valuation Technique used | Discounted Cash flow | Discounted Cash flow |
Significant Unobservable Inputs | Average Historical Basis | Average Historical Basis |
Average Historical Basis | (22.00%) |  |
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 | (70.00%) |  | (50.00%)
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%

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