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Asset Retirement Obilgations Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Asset Retirement Obligations [Abstract]
Damages sought in USDOE claim	$ 128
PGE Share of Recovery from USDOE Claims	67.00%
Asset Retirement Obligation Increase related to Boardman plant	20
Asset Retirement Obligation Rate Recovery related to Trojan Plant	$ 4

X

- Definition

Asset Retirement Obligation Increase related to Boardman plant due to updated decommissioning study.

+ References

No definition available.

+ Details

Name:	por_AssetRetirementObligationIncreaseRelatedToBoardmanPlant
Namespace Prefix:	por_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

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- Definition

Asset Retirement Obligation Rate Recovery related to Trojan Plant

+ References

No definition available.

+ Details

Name:	por_AssetRetirementObligationRateRecoveryRelatedToTrojanPlant
Namespace Prefix:	por_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	por_AssetRetirementObligationsAbstract
Namespace Prefix:	por_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Damages sought in USDOE claim

+ References

No definition available.

+ Details

Name:	por_DamagesSoughtInUsdoeClaim
Namespace Prefix:	por_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

PGE Share of Recovery from USDOE Claims

+ References

No definition available.

+ Details

Name:	por_PgeShareOfRecoveryFromUsdoeClaims
Namespace Prefix:	por_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration