Carrying value on the balance sheet for obligations of less than one year for renewable energy and energy efficiency programs the company is obligated to participate.

No definition available.

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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

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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- Definition

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2014	Dec. 31, 2016
Loss Contingencies [Line Items]
Clean Energy Program, current portion	$ 86		$ 142
PSE And G [Member]
Loss Contingencies [Line Items]
Clean Energy Program, current portion	86		$ 142
Power [Member] \| FERC Compliance [Domain]
Loss Contingencies [Line Items]
Loss Contingency related to bidding errors	10	$ 25
Maximum [Member] \| Power [Member] \| FERC Compliance [Domain]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	135
Minimum [Member] \| Power [Member] \| FERC Compliance [Domain]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 35