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Fair Value of FInancial Instruments Fair Value Options Quantitative Disclosure (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Commodity Contract Asset, Natural gas | $ 4,000,000 | $ 5,000,000
Commodity Contract Liabilities, Electricity | 127,000,000 | 82,000,000
Commodity Contract Liabilities, Natural gas | 63,000,000 | 118,000,000
Assets [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 0 |
Natural gas financial swaps | 0 | 2,000,000
Fnancial swaps - electricity | 1,000,000 | 0
Total commodity contracts | 1,000,000 | 2,000,000
Derivative Financial Instruments, Liabilities [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 103,000,000 |
Natural gas financial swaps | 23,000,000 | 8,000,000
Fnancial swaps - electricity | 14,000,000 | 10,000,000
Total commodity contracts | 140,000,000 | 18,000,000
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Commodity Contract Asset, Natural gas | 0 | 2,000,000
Commodity Contract Liabilities, Electricity | 117,000,000 | 10,000,000
Commodity Contract Liabilities, Natural gas | 23,000,000 | 8,000,000
Weighted Average [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 40.18 |
Natural gas financial swaps | 3.71 | 4.28
Fnancial swaps - electricity | 33.01 | 41.14
Maximum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 77.95 |
Natural gas financial swaps | 4.49 | 5.21
Fnancial swaps - electricity | 46.07 | 51.72
Minimum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 9.63 |
Natural gas financial swaps | 3.16 | 3.67
Fnancial swaps - electricity | $ 9.63 | $ 7.12

X
- Definition Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to purchases or sales of natural gas. + References No definition available. + Details
Name: | por_CommodityContractAssetNaturalGas
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Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of the liabilities arising from commodity contracts related to purchases or sales of electricity. + References No definition available. + Details
Name: | por_CommodityContractLiabilitiesElectricity
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of the liabilities arising from commodity contracts related to purchases or sales of natural gas. + References No definition available. + Details
Name: | por_CommodityContractLiabilitiesNaturalGas
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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X
- Definition Electricity physical forward purchase + References No definition available. + Details
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X
- Definition Fnancial swaps - electricity + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition Natural gas financial swaps + References No definition available. + Details
Name: | por_NaturalGasFinancialSwaps
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Total commodity contracts + References No definition available. + Details
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X
- Details
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