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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value |  | $ 0 | $ 12
Liabilities, Fair Value |  | (8) | (5)
PSEG Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value |  | 0 | 12
Liabilities, Fair Value |  | (8) | (5)
Electric Load Contracts [Member] | PSEG Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value |  | 0 | 12
Liabilities, Fair Value |  | $ (6) | 0
Valuation Technique used | Discounted Cash Flow | Discounted Cash Flow |
Significant Unobservable Inputs | Load Shaping Cost | Load Shaping Cost |
Historic Load Variability | 4.00% | 5.00% |
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
Liabilities, Fair Value |  |  | (2)
Valuation Technique used | Discounted Cash Flow |  |
Significant Unobservable Inputs | Historical Basis Adjustment |  |
Average Historical Basis | (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 | (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%) |  |
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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