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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Jun. 30, 2013
Equity [Abstract] |  |
Share Price |  | $ 29.50 us-gaap_SharePrice
Equity Forward Sale Agreement, Settlement Threshold | 10,400,000 por_EquityForwardSaleAgreementSettlementThreshold |
Equity Forward Sale Agreement future settlement amount | $ 272 por_Equityforwardsaleagreementfuturesettlementamount |
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value | 114 us-gaap_OptionIndexedToIssuersEquitySettlementAlternativesCashAtFairValue |
Net share settlement | 3,074,000 por_Netsharesettlement |
Proceeds from Issuance of Common Stock | $ 0 us-gaap_ProceedsFromIssuanceOfCommonStock |

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- Definition Funds that would be received undter the equity forward sale agreement in the future. + References No definition available. + Details
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Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Shares required to contractually settle Equity forward sale agreement requirements. + References No definition available. + Details
Name: | por_EquityForwardSaleAgreementSettlementThreshold
Namespace Prefix: | por_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Net share settlement + References No definition available. + Details
Name: | por_Netsharesettlement
Namespace Prefix: | por_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value of each cash settlement alternative for each freestanding option contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90205-114008 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant