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, 2016	Dec. 31, 2015
Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	$ 15	$ 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	0	13
Liabilities, Fair Value	(4)	(11)
PSEG [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	15	25
Liabilities, Fair Value	(4)	(12)
Various [Member] \| Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	3	1
Liabilities, Fair Value	0	0
Electric Load Contracts [Member] \| Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	12	11
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	$ 0	$ 13
Liabilities, Fair Value	$ (4)	$ (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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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=36462937&loc=d3e19207-110258

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Description of the inputs and valuation technique(s) used to measure fair value.

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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=36462937&loc=d3e19207-110258

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Fair value of financial and nonfinancial obligations.

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