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Price Risk Management Collateral Posted With Counterparties Where Master Netting Arragements Exist (Details) (USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
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Derivative, Collateral, Master Netting Arrangements, Letters of Credit | $ 17 | $ 31

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- Definition The amount of collateral posted pursuant to derivative instruments with counterparties where a master netting arrangement exists, consisting of letters of credit. + Details
Name: | por_DerivativeCollateralMasterNettingArrangementsLettersOfCredit
Namespace Prefix: | por
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant