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Variable Interest Entities (Details) (USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Cash and cash equivalents | $ 0 | $ 1
Accounts receivable, net | 0 | 4
Electric utility plant, net | $ 5 | $ 5

X
- Definition The carrying amount of the consolidated variable interest entities' accounts receivable, net included in the reporting entity's consolidated statement of financial position. + Details
Name: | por_VariableInterestEntityConsolidatedCarryingamountAccountsReceivableNet
Namespace Prefix: | por
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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. + 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. + Details
Name: | por_VariableInterestEntityConsolidatedCarryingAmountElectricUtilityPlantNet
Namespace Prefix: | por
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant