XML 33 R24.htm IDEA: XBRL DOCUMENT
v3.22.2

Basis of Presentation (Details) retail_customers in Thousands, mi² in Thousands, $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2022 USD ($) mi² retail_customers | Jun. 30, 2021 USD ($)
Basis of Presentation [Abstract] |  |
Service Area Sq Miles | mi² | 4 |
Incorporated Cities | 51 |
Number of Retail Customers | retail_customers | 922 |
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities | $ | $ 149 | $ 17

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-types: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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration