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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | $ 12 |  | $ 7
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (5) |  | (6)
PSE&G [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  |  | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  |  | (5)
Power [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | 12 |  | 7
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ (5) |  | (1)
Forward Contracts [Member] | PSE&G [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  |  | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  |  | $ (5)
Fair Value Measurements, Valuation Techniques |  |  | Discounted Cash Flow
Fair Value Measurement With Significant Unobservable Inputs |  |  | Transportation Costs
Forward Contracts [Member] | Dekatherms [Member] | PSE&G [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Transportation Costs |  |  | 0.60
Forward Contracts [Member] | Dekatherms [Member] | PSE&G [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Transportation Costs |  |  | 0.80
Electric Load Contracts [Member] | Power [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | $ 1 |  | $ 7
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ (3) |  | $ (1)
Fair Value Measurements, Valuation Techniques | Discounted Cash flow |  | Discounted Cash Flow
Fair Value Measurement With Significant Unobservable Inputs | Historic Load Variability |  | Historic Load Variability
Electric Load Contracts [Member] | Power [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Historic Load Variability | 0.00% |  | 0.00%
Electric Load Contracts [Member] | Power [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Historic Load Variability | 10.00% |  | 10.00%
Various [Member] | Power [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | $ 11 | [1] | $ 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ (2) | [1] | $ 0
[1] | Includes gas positions which were immaterial.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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