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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | $ 5 |  | $ 12 |
Liabilities, Fair Value | 0 |  | (1) |
PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 4 |  | 26 |
Liabilities, Fair Value | (7) |  | 0 |
PSEG [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 9 |  | 38 |
Liabilities, Fair Value | (7) |  | (1) |
Various [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 1 | [1] | 0 | [2]
Liabilities, Fair Value | 0 | [1] | 0 | [2]
Electric Load Contracts [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 4 |  | 12 |
Liabilities, Fair Value | $ 0 |  | $ (1) |
Valuation Technique (s) | Discounted Cash flow |  | Discounted Cash Flow |
Significant Unobservable Inputs | Historic Load Variability |  | Historic Load Variability |
Electric Load Contracts [Member] | Minimum [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Historic Load Variability | 10.00% |  | 10.00% |
Electric Load Contracts [Member] | Maximum [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Historic Load Variability | 0.00% |  | 0.00% |
Natural Gas Supply Contracts [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | $ 4 |  | $ 26 |
Liabilities, Fair Value | $ (7) |  | $ 0 |
Valuation Technique (s) | Discounted Cash Flow |  | Discounted Cash Flow |
Significant Unobservable Inputs | Transportation Costs |  | Transportation Costs |
Natural Gas Supply Contracts [Member] | Minimum [Member] | MWh [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Transportation Costs | 0.60 |  | 0.70 |
Natural Gas Supply Contracts [Member] | Maximum [Member] | MWh [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Transportation Costs | 0.90 |  | 1 |
[1] | Includes long-term electric positions which were immaterial as of September 30, 2015.
[2] | Includes gas supply positions and long-term electric capacity positions which were immaterial as of December 31, 2014.

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