Average Historical Basis

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- Definition

Fair value, measurement with significant unobservable inputs

+ References

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- Definition

Historic Load Variability

+ References

No definition available.

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- Definition

Valuation Technique used

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

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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, 2019	Mar. 31, 2018	Dec. 31, 2018
PSEG [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	$ 1		$ 7
Liabilities, Fair Value	(3)		(6)
Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	1		7
Liabilities, Fair Value	(3)		(6)
Various [Member] \| Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value			5
Liabilities, Fair Value			(1)
Electric Load Contracts [Member] \| Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	1		2
Liabilities, Fair Value	$ (3)		$ (5)
Valuation Technique used	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	15.00%		15.00%
Gas Physical Contract [Member] \| Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique used			Discounted Cash flow
Significant Unobservable Inputs			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%)
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%