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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