XML 107 R97.htm IDEA: XBRL DOCUMENT
v3.22.4

Commitments and Guarantees Schdule of Long term contracts for purchase of electric power (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) MW | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Priest Rapids and Wanapum [Member] |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Revenue Bonds issued by the Public Utility Districts | $ 2,042 |  |
PGE Share of Output | 8.60% |  |
PGE Share of Capacity | MW | 163 |  |
commitment costs | $ 45 | $ 26 | $ 25
Wells [Member] |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Revenue Bonds issued by the Public Utility Districts | $ 421 |  |
PGE Share of Output | 18.80% |  |
PGE Share of Capacity | MW | 113 |  |
commitment costs | $ 12 | $ 13 | $ 23

X
- Definition commitment costs of contracts with the Public Utility Districts + References No definition available. + Details
Name: | por_CommitmentCosts
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition PGE portion of Capacity from Public Utility Districts + References No definition available. + Details
Name: | por_PgePortionOfCapacity
Namespace Prefix: | por_
Data Type: | dtr-types:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition PGE Share of Output from the individual Public Utility Districts + References No definition available. + Details
Name: | por_PgeShareOfOutput
Namespace Prefix: | por_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Revenue Bonds issued by the Public Utility Districts + References No definition available. + Details
Name: | por_RevenueBondsIssuedByPublicUtilityDistricts
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_LongTermContractForPurchaseOfElectricPowerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=por_PriestRapidsAndWanapumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=por_WellsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |