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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) (USD $) | Mar. 31, 2012
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Fair Value, Option, Quantitative Disclosures [Line Items] |
Electricity financial swaps | $ 36,000,000
Natural gas financial swaps | 60,000,000
Minimum [Member] |
Fair Value, Option, Quantitative Disclosures [Line Items] |
Electricity financial swaps | 5.99
Natural gas financial swaps | 2.85
Maximum [Member] |
Fair Value, Option, Quantitative Disclosures [Line Items] |
Electricity financial swaps | 49.70
Natural gas financial swaps | 4.83
Weighted average [Member] |
Fair Value, Option, Quantitative Disclosures [Line Items] |
Electricity financial swaps | 38.33
Natural gas financial swaps | $ 3.71

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- Definition Electricity financial swaps + References No definition available. + Details
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Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Natural gas financial swaps + References No definition available. + Details
Name: | por_NaturalGasFinancialSwaps
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration