XML 44 R34.htm IDEA: XBRL DOCUMENT
v3.20.2

Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | $ 2.69 | $ 12.53
Natural gas financial swaps | 1.44 | 1.39
Financial swaps - electricity | 13.25 | 10.57
High [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 38.84 | 59.00
Natural gas financial swaps | 3.91 | 3.73
Financial swaps - electricity | 51.03 | 66.32
Weighted Average [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 29.51 | 36.92
Natural gas financial swaps | 2.12 | 1.90
Financial swaps - electricity | 36.29 | 45.11
Assets [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 0 | 0
Natural gas financial swaps | 3,000,000 | 1,000,000
Financial swaps - electricity | 0 | 7,000,000
Total commodity contracts | 3,000,000 | 8,000,000
Liabilities [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 147,000,000 | 104,000,000
Natural gas financial swaps | 0 | 0
Financial swaps - electricity | 7,000,000 | 1,000,000
Total commodity contracts | $ 154,000,000 | $ 105,000,000

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: |