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Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Variable Interest Entity, Cash and cash equivalents |  | $ 1
Variable Interest Entity, Electric utility plant, net | $ 5 | $ 5

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 carrying amount of the variable interest entities' electric utility plant, net included in the reporting entity's consolidated statement of financial position. + References No definition available. + Details
Name: | por_VariableInterestEntityConsolidatedCarryingAmountElectricUtilityPlantNet
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant