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Price Risk Management Net volumes related to price risk management activities (Details) (CAD) In Millions, unless otherwise specified | Mar. 31, 2012 MMBTU MWh | Dec. 31, 2011 MWh MMBTU
--- | --- | ---
Commodity contracts: |  |
Electricity | 12,000,000 | 13,000,000
Natural gas | 71,000,000 | 79,000,000
Foreign currency | 7 | 6

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

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- Definition Net volume associated with the reporting entity's derivative instruments recorded as of the balance sheet date having arisen from price risk management activities related to natural gas. + References No definition available. + Details
Name: | por_VolumeRelatedToDerivativeInstrumentsAtBalanceSheetDateCommodityContractsNaturalGas
Namespace Prefix: | por_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | instant

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- Definition Net volume related to the reporting entity's derivative instruments as of the balance sheet date having arisn from price risk management activities. + References No definition available. + Details
Name: | por_VolumeRelatedToDerivativeInstrumentsHeldAtBalanceSheetDateCommodityContractsElectricity
Namespace Prefix: | por_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | instant

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- Definition Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
Name: | us-gaap_NotionalAmountOfForeignCurrencyDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant