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Price Risk Management (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative, Collateral, Master Netting Arrangements, Letters of Credit	$ 11por_DerivativeCollateralMasterNettingArrangementsLettersOfCredit	$ 7por_DerivativeCollateralMasterNettingArrangementsLettersOfCredit
Net gain or loss recognized in the statement of income offset by regulatory accounting	83por_NetGainOrLossRecognizedInStatementOfIncomeOffsetByRegulatoryAccounting	120por_NetGainOrLossRecognizedInStatementOfIncomeOffsetByRegulatoryAccounting	42por_NetGainOrLossRecognizedInStatementOfIncomeOffsetByRegulatoryAccounting
Derivative, Net Liability Position, Aggregate Fair Value	216us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
Collateral Already Posted, Aggregate Fair Value	29us-gaap_CollateralAlreadyPostedAggregateFairValue
Collateral Aggregate Fair Value	213por_CollateralAggregateFairValue
Margin Deposit Assets	$ 11us-gaap_MarginDepositAssets	$ 9us-gaap_MarginDepositAssets

X

- Definition

The aggregate fair value of assets that would be required to be posted as collateral for derviative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	por_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of collateral posted pursuant to derivative instruments with counterparties where a master netting arrangement exists, consisting of letters of credit.

+ References

No definition available.

+ Details

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Namespace Prefix:	por_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Net gain or loss recognized in the statement of income for derivative instruments related to price risk management activities offset by regulatory accounting.

+ References

No definition available.

+ Details

Name:	por_NetGainOrLossRecognizedInStatementOfIncomeOffsetByRegulatoryAccounting
Namespace Prefix:	por_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624258-113959

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624258-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8,17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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