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Credit Agreements - Additional Information (Details) - Avista Utilities [Member] - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Short-term Debt [Line Items] |  |
Letters of credit outstanding | $ 5 | $ 5
Line of credit facility, covenant terms, maximum debt to equity ratio | 65.00% |

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- Definition Line of Credit Facility, Covenant Terms, Maximum Debt to Equity Ratio + References No definition available. + Details
Name: | ava_LineofCreditFacilityCovenantTermsMaximumDebttoEquityRatio
Namespace Prefix: | ava_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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_ShortTermDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ava_AvistaUtilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |