XML 74 R62.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Fair Value of FInancial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Minimum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | $ 16.66 | $ 11.17
Natural gas financial swaps | 2.02 | 1.52
Fnancial swaps - electricity | 26.76 | 8.78
Maximum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 129.75 | 51.18
Natural gas financial swaps | 8.02 | 4.33
Fnancial swaps - electricity | 68.43 | 58.42
Weighted Average [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 43.73 | 29.74
Natural gas financial swaps | 2.81 | 2.29
Fnancial swaps - electricity | 52.46 | 43.71
Assets [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 0 | 0
Natural gas financial swaps | 5,000,000 | 1,000,000
Fnancial swaps - electricity | 1,000,000 | 4,000,000
Total commodity contracts | 6,000,000 | 5,000,000
Liabilities [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 90,000,000 | 141,000,000
Natural gas financial swaps | 1,000,000 | 1,000,000
Fnancial swaps - electricity | 0 | 0
Total commodity contracts | $ 91,000,000 | $ 142,000,000

X
- Definition Electricity physical forward purchase + References No definition available. + Details
Name: | por_ElectricityPhysicalForwardPurchase
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fnancial swaps - electricity + References No definition available. + Details
Name: | por_FnancialSwapsElectricity
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
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
Period Type: | instant

X
- Definition Total commodity contracts + References No definition available. + Details
Name: | por_TotalCommodityContracts
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_AvailableforsaleSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |