XML 13 R48.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Cash and cash equivalents | $ 1 | $ 1
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