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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, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value | $ 3 | $ 12
Liabilities, Fair Value | (4) | (5)
PSEG Power [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value | 3 | 12
Liabilities, Fair Value | (4) | (5)
Electric Load Contracts [Member] | PSEG Power [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value | 3 | 12
Liabilities, Fair Value | $ (1) | $ 0
Valuation Technique used | Discounted Cash Flow | Discounted Cash Flow
Significant Unobservable Inputs | Load Shaping Cost | Load Shaping Cost
Historic Load Variability | 4.00% | 4.00%
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 | 11.00% | 11.00%
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 | $ (1) | $ (2)
Valuation Technique used | Discounted Cash Flow | Discounted Cash Flow
Significant Unobservable Inputs | Historical Basis Adjustment | Historical Basis Adjustment
Average Historical Basis | (10.00%) | (43.00%)
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 | (2.00%) | (60.00%)
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 | (30.00%) | (30.00%)
Other (Futures Contracts) | 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)

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