XML 46 R36.htm IDEA: XBRL DOCUMENT
v3.24.3

Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | $ 23.00 | $ 37.53
Natural gas financial swaps | 1.88 | 2.25
Financial swaps - electricity | 48.00 | 65.30
High [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 114.15 | 153.33
Natural gas financial swaps | 3.51 | 8.89
Financial swaps - electricity | 120.00 | 107.31
Weighted Average [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 69.61 | 84.58
Natural gas financial swaps | 2.42 | 3.37
Financial swaps - electricity | 80.28 | 91.33
Assets [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 0 | 14,000,000
Natural gas financial swaps | 0 | 0
Financial swaps - electricity | 0 | 0
Total commodity contracts | 0 | 14,000,000
Liabilities [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 23,000,000 | 43,000,000
Natural gas financial swaps | 32,000,000 | 16,000,000
Financial swaps - electricity | 7,000,000 | 0
Total commodity contracts | $ 62,000,000 | $ 59,000,000

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-30 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-32 + 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_AssetsMember
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: |