XML 43 R34.htm IDEA: XBRL DOCUMENT
v3.22.1

Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | $ 20.00 | $ 16.66
Natural gas financial swaps | 2.55 | 2.02
Financial swaps - electricity | 20.00 | 26.76
High [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 146.53 | 129.75
Natural gas financial swaps | 5.83 | 8.02
Financial swaps - electricity | 146.53 | 68.43
Weighted Average [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 51.04 | 43.73
Natural gas financial swaps | 3.08 | 2.81
Financial swaps - electricity | 58.40 | 52.46
Assets [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 0 | 0
Natural gas financial swaps | 18,000,000 | 5,000,000
Financial swaps - electricity | 1,000,000 | 1,000,000
Total commodity contracts | 19,000,000 | 6,000,000
Liabilities [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 70,000,000 | 90,000,000
Natural gas financial swaps | 0 | 1,000,000
Financial swaps - electricity | 1,000,000 | 0
Total commodity contracts | $ 71,000,000 | $ 91,000,000

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_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: |