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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value | $ 11 |  | $ 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 | 10 |  | 13
Liabilities, Fair Value | 0 |  | (11)
PSEG [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value | 21 |  | 25
Liabilities, Fair Value | 0 |  | (12)
Various [Member] | Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value |  |  | 1
Liabilities, Fair Value |  |  | 0
Electric Load Contracts [Member] | Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value | 11 |  | 11
Liabilities, Fair Value | $ 0 |  | (1)
Valuation Technique (s) | Discounted Cash flow | Discounted Cash Flow |
Significant Unobservable Inputs | 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 | $ 10 |  | 13
Liabilities, Fair Value | $ 0 |  | $ (11)
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 | 0.60 |
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 | 0.80 | 0.80 |

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