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Revenue - Schedule of Utilities Operating Revenue Expense Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Revenue from Contract with Customer [Abstract] |  |
Utility-related taxes | $ 27 | $ 27

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- Definition Public Utility Operating Expenses Excise Taxes Collected and Reported Gross in Revenues and Operating Expenses + References No definition available. + Details
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Namespace Prefix: | ava_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration