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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, Fair Value Disclosure | $ 12 | $ 10
Liabilities, Fair Value Disclosure | (5) | (3)
PSEG Power LLC |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, Fair Value Disclosure | 12 | 10
Liabilities, Fair Value Disclosure | (5) | (3)
Electric Load Contracts [Member] | PSEG Power LLC |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, Fair Value Disclosure | 12 | 10
Liabilities, Fair Value Disclosure | $ 0 | $ 0
Valuation Technique used | Discounted Cash flow | Discounted Cash flow
Fair Value Measurement With Significant Unobservable Inputs | Load Shaping Cost | Historic Load Variability
Historic Load Variability | 4.00% |
Electric Load Contracts [Member] | PSEG Power LLC | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Historic Load Variability |  | 0.00%
Load Shaping Cost | 0.00% |
Electric Load Contracts [Member] | PSEG Power LLC | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Historic Load Variability |  | 10.00%
Load Shaping Cost | 11.00% |
Gas Physical Contract [Member] | PSEG Power LLC |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, Fair Value Disclosure | $ 0 | $ 0
Liabilities, Fair Value Disclosure | $ (2) | $ (3)
Valuation Technique used | Discounted Cash flow | Discounted Cash flow
Fair Value Measurement With Significant Unobservable Inputs | Historical Basis Adjustment | Average Historical Basis
Average Historical Basis | (43.00%) |
Gas Physical Contract [Member] | PSEG Power LLC | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Average Historical Basis | (60.00%) | 50.00%
Gas Physical Contract [Member] | PSEG Power LLC | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Average Historical Basis | (30.00%) |
Other (Futures Contracts) [Member] | PSEG Power LLC |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, Fair Value Disclosure | $ 0 |
Liabilities, Fair Value Disclosure | $ (3) |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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