XML 51 R100.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Variable Interest Entities Schedule of Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Cash and cash equivalents | $ 1 | $ 1
Accounts receivable | 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. + References No definition available. + 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. + 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

X
- Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration