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

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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

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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

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Fair value of financial and nonfinancial obligations.

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