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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, 2019 | Dec. 31, 2018
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, Fair Value Disclosure | $ 10 |
Liabilities, Fair Value Disclosure | (3) |
PSEG Power LLC |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, Fair Value Disclosure |  | $ 7
Liabilities, Fair Value Disclosure |  | (6)
Electric Load Contracts [Member] | PSEG Power LLC |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, Fair Value Disclosure | 10 | 2
Liabilities, Fair Value Disclosure | $ 0 | $ (5)
Valuation Technique used | Discounted Cash flow | Discounted Cash flow
Fair Value Measurement With Significant Unobservable Inputs | Historic Load Variability | Historic Load Variability
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% | 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% | 15.00%
Gas Physical Contract [Member] | PSEG Power LLC |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, Fair Value Disclosure | $ 0 | $ 5
Liabilities, Fair Value Disclosure | $ (3) | $ (1)
Valuation Technique used | Discounted Cash flow | Discounted Cash flow
Fair Value Measurement With Significant Unobservable Inputs | Average Historical Basis | Average Historical Basis
Gas Physical Contract [Member] | PSEG Power LLC | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Average Historical Basis | (50.00%) | (40.00%)
Gas Physical Contract [Member] | PSEG Power LLC | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Average Historical Basis | 0.00% | 0.00%

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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