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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, 2016 | Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | $ 7 |  | $ 25
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (6) |  | (12)
PSE&G [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | 0 |  | 13
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (5) |  | (11)
Power [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | 7 |  | 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 | 0 |  | 13
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ (5) |  | $ (11)
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] | Dekatherms [Member] | PSE&G [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Transportation Costs | 0.60 |  | 0.60
Forward Contracts [Member] | Dekatherms [Member] | PSE&G [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Transportation Costs | 0.80 |  | 0.80
Electric Load Contracts [Member] | Power [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | $ 7 |  | $ 11
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 | $ 0 | [1] | $ 1
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 0 | [1] | $ 0
[1] | Includes gas supply positions which were immaterial as of December 31, 2016.

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