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Fair Value of Financial Instruments Unobservable Input Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of the beginning of the period	$ 158	$ 168	$ 119	$ 100
Net realized and unrealized losses (gains)	0	15	40	85
Transfers out of Level 3 to Level 2	2	(14)	1	16
Balance as of the end of the period	$ 160	$ 169	$ 160	$ 169

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- Definition

Net Liabilities From Price Risk Management Activities Classified as Level 3

+ References

No definition available.

+ Details

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Namespace Prefix:	por_
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Balance Type:	credit
Period Type:	instant

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
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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=66048111&loc=d3e19207-110258

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