XML 34 R24.htm IDEA: XBRL DOCUMENT
v3.24.2

Basis of Presentation (Details) retail_customers in Thousands, mi² in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) mi² retail_customers | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) mi² retail_customers | Jun. 30, 2023 USD ($)
Basis of Presentation [Abstract] |  |  |  |
Service Area Sq Miles | mi² | 4 |  | 4 |
Incorporated Cities | 51 |  | 51 |
Number of Retail Customers | retail_customers | 944 |  | 944 |
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities |  |  | $ 0 | $ (135)
Investment Income, Interest | $ 5 | $ 3 | $ 9 | $ 11

X
- Definition Basis of Presentation [Abstract] + References No definition available. + Details
Name: | por_BasisOfPresentationAbstract
Namespace Prefix: | por_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of incorporated cities in service area. + References No definition available. + Details
Name: | por_IncorporatedCities
Namespace Prefix: | por_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Includes residential, commercial and industrial. + References No definition available. + Details
Name: | por_NumberOfRetailCustomers
Namespace Prefix: | por_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Approximate square miles of service area. + References No definition available. + Details
Name: | por_ServiceAreaSqMiles
Namespace Prefix: | por_
Data Type: | dtr-types1:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The increase (decrease) during the reporting period in other obligations or expenses incurred but not yet paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_InvestmentIncomeInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration