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Long term debt (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2014 | Dec. 31, 2014 | Sep. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from Issuance of First Mortgage Bond |  |  |  |  | $ 280 us-gaap_ProceedsFromIssuanceOfFirstMortgageBond |  |  |
Long-term Pollution Control Bond |  | 21 por_RemarketablePollutionControlBonds |  |  | 21 por_RemarketablePollutionControlBonds |  |  |
Pollution Control Bonds Retired |  |  |  | (6)por_PollutionControlBondsRetired |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.51%us-gaap_DebtInstrumentInterestRateStatedPercentage | 4.44%us-gaap_DebtInstrumentInterestRateStatedPercentage | 4.39%us-gaap_DebtInstrumentInterestRateStatedPercentage |  | 4.44%us-gaap_DebtInstrumentInterestRateStatedPercentage |  |  |
Proceeds from Issuance of Long-term Debt | 80 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 100 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 100 us-gaap_ProceedsFromIssuanceOfLongTermDebt |  | 585 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 380 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt |
Unsecured Debt, Current |  | 305 us-gaap_UnsecuredDebtCurrent |  |  | 305 us-gaap_UnsecuredDebtCurrent | 0 us-gaap_UnsecuredDebtCurrent |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  | 70 |  |  |
First mortgage Bonds - minimum rate |  | 3.46%por_FirstMortgageBondsMinimumRate |  |  | 3.46%por_FirstMortgageBondsMinimumRate | 3.46%por_FirstMortgageBondsMinimumRate |  |
First Mortgage Bonds - maximum rate |  | 9.31%por_FirstMortgageBondsMaximumRate |  |  | 9.31%por_FirstMortgageBondsMaximumRate | 9.31%por_FirstMortgageBondsMaximumRate |  |
Debt, Weighted Average Interest Rate |  | 5.42%us-gaap_DebtWeightedAverageInterestRate |  |  | 5.42%us-gaap_DebtWeightedAverageInterestRate | 5.62%us-gaap_DebtWeightedAverageInterestRate |  |
Unsecured term bank loan rate - minimum |  | 0.86%por_Unsecuredtermbankloanrateminimum |  |  | 0.86%por_Unsecuredtermbankloanrateminimum |  |  |
Unsecured term bank loan rate - maximum |  | 0.93%por_Unsecuredtermbankloanratemaximum |  |  | 0.93%por_Unsecuredtermbankloanratemaximum |  |  |
Pollution Control Revenue Bonds owned by PGE |  | 21 por_PollutionControlRevenueBondsOwnedByPge |  |  | 21 por_PollutionControlRevenueBondsOwnedByPge | 27 por_PollutionControlRevenueBondsOwnedByPge |  |
Long-term Pollution Control Bond, Rate |  | 5.00%por_LongTermPollutionControlBondRate |  |  | 5.00%por_LongTermPollutionControlBondRate | 5.00%por_LongTermPollutionControlBondRate |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 3.55%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  | $ 75 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition First Mortgage Bonds - maximum rate + References No definition available. + Details
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- Definition First mortgage Bonds - minimum rate + References No definition available. + Details
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- Definition Long-term Pollution Control Bond, Rate + References No definition available. + Details
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- Definition Pollution Control Bonds Retired + References No definition available. + Details
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- Definition Pollution Control Revenue Bonds owned by PGE + References No definition available. + Details
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- Definition Remarketable Pollution Control Bonds held by the Company. + References No definition available. + Details
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- Definition Unsecured term bank loan rate - maximum + References No definition available. + Details
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- Definition Unsecured term bank loan rate - minimum + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition The cash inflow from amounts received from a long-term debt instrument secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. + 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 (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + 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 (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Carrying value as of the balance sheet date of the portion of long-term, uncollateralized debt obligations due within one year or the normal operating cycle, if longer. + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 + Details
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