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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, 2015 | Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 25 |  | $ 38 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (12) |  | (1) |
PSE&G [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Assets, Fair Value Disclosure | 13 |  | 26 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (11) |  | 0 |
Power [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Assets, Fair Value Disclosure | 12 |  | 12 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (1) |  | (1) |
Forward Contracts [Member] | PSE&G [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Assets, Fair Value Disclosure | 13 |  | 26 | [1]
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ (11) |  | $ 0 | [1]
Fair Value Measurements, Valuation Techniques | Discounted Cash Flow |  | Discounted Cash Flow |
Fair Value Measurement With Significant Unobservable Inputs | Transportation Costs |  | Transportation Costs |
Forward Contracts [Member] | Megawatt Hours [Member] | PSE&G [Member] | Minimum [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Transportation Costs | 0.60 |  | 0.70 |
Forward Contracts [Member] | Megawatt Hours [Member] | PSE&G [Member] | Maximum [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Transportation Costs | 0.80 |  | 1.00 |
Electric Load Contracts [Member] | Power [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 11 |  | $ 12 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ (1) |  | $ (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 | $ 1 | [2] | $ 0 | [1]
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 0 | [2] | $ 0 | [1]
[1] | Includes gas supply positions and long-term electric capacity positions which were immaterial as of December 31, 2014.
[2] | Includes long-term electric capacity positions which were immaterial as of December 31, 2015.

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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=36462937&loc=d3e19207-110258 + Details
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