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Fair Value of Financial Instruments Unobservable Input Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of the beginning of the period	$ 148	$ 131	$ 100	$ 139
Net realized and unrealized losses (gains)	20	(44)	70	(55)
Transfers out of Level 3 to Level 2	0	2	(2)	(5)
Balance as of the end of the period	$ 168	$ 89	$ 168	$ 89

X

- Definition

Net Liabilities From Price Risk Management Activities Classified as Level 3

+ References

No definition available.

+ Details

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X

- Definition

Realized and Unrealized Gains and Losses, Net, Commodity Contracts

+ References

No definition available.

+ Details

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Namespace Prefix:	por_
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X

- 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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

+ 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 (c)(3)



-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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