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Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Variable interest Entities [Abstract] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | $ 4 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet | $ 5 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet
Variable Interest Entity, Consolidated, Carrying Amount, Cash and Cash Equivalents |  | $ 1 por_VariableInterestEntityConsolidatedCarryingAmountCashAndCashEquivalents
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 1.00%us-gaap_VariableInterestEntityOwnershipPercentage |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest | 99.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions |
Estimated Remaining Useful Life of Facility Acquired | 75.00%por_EstimatedRemainingUsefulLifeOfFacilityAcquired |

X
- Definition Estimated useful life expected to be remaining at the date of purchase in a future period. + References No definition available. + Details
Name: | por_EstimatedRemainingUsefulLifeOfFacilityAcquired
Namespace Prefix: | por_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | por_VariableInterestEntitiesAbstract
Namespace Prefix: | por_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying amount of the consolidated variable interest entities' cash and cash equivalents included in the reporting entity's statement of financial position. + References No definition available. + Details
Name: | por_VariableInterestEntityConsolidatedCarryingAmountCashAndCashEquivalents
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of units or percentage investment held by one or more members or limited partners of the LLC or LP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
Name: | us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References No definition available. + Details
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net carrying amount of the consolidated Variable Interest Entity's assets and liabilities included in the reporting entity's statement of financial position. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685 + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration