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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