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Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Sep. 30, 2013	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]
Damages sought in USDOE claim					$ 112por_DamagesSoughtInUsdoeClaim
Asset Retirement Obligation Rate Recovery related to Trojan Plant					4por_AssetRetirementObligationRateRecoveryRelatedToTrojanPlant
Loss Contingency, Damages Awarded, Value			70us-gaap_LossContingencyDamagesAwardedValue		9us-gaap_LossContingencyDamagesAwardedValue
Proceeds from Legal Settlements				50us-gaap_ProceedsFromLegalSettlements	6us-gaap_ProceedsFromLegalSettlements	44us-gaap_ProceedsFromLegalSettlements	0us-gaap_ProceedsFromLegalSettlements
Asset Retirement Obligation, Liabilities Incurred	$ 7us-gaap_AssetRetirementObligationLiabilitiesIncurred	$ 8us-gaap_AssetRetirementObligationLiabilitiesIncurred			$ 15us-gaap_AssetRetirementObligationLiabilitiesIncurred	$ 4us-gaap_AssetRetirementObligationLiabilitiesIncurred	$ 0us-gaap_AssetRetirementObligationLiabilitiesIncurred

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- Definition

Asset Retirement Obligation Rate Recovery related to Trojan Plant

+ References

No definition available.

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- Definition

Damages sought in USDOE claim

+ References

No definition available.

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- Definition

Amount of asset retirement obligations incurred during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Amount of damages awarded to the plaintiff in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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- Definition

Cash received for the settlement of litigation during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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