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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
PSEG [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value | $ 7 | $ 12
Liabilities, Fair Value | 0 | (5)
Power [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value | 7 | 12
Liabilities, Fair Value | 0 | (5)
Various [Member] | Power [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value | 1 | 11
Liabilities, Fair Value | 0 | (2)
Electric Load Contracts [Member] | Power [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value | 6 | 1
Liabilities, Fair Value | $ 0 | $ (3)
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 | 0.00% | 0.00%
Electric Load Contracts [Member] | Maximum [Member] | Power [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Historic Load Variability | 10.00% | 10.00%
Gas Physical Contract [Member] | Power [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Valuation Technique (s) | Discounted Cash flow | Discounted Cash flow
Significant Unobservable Inputs | Average Historical Basis | Average Historical Basis
Gas Physical Contract [Member] | Minimum [Member] | Power [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Average Historical Basis | (40.00%) | (40.00%)
Gas Physical Contract [Member] | Maximum [Member] | Power [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Average Historical Basis | 0.00% | (10.00%)

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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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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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