XML 121 R84.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Equity Investments - Summary of Net Unrealized Gains Related to Investments without Readily Determinable Fair Value (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Equity Investments [Line items] |  |  |
Total | $ 0 | $ (4) | $ 45
Recurring fair value [Member] |  |  |
Equity Investments [Line items] |  |  |
Unrealized gain | 0 | (4) | 33
Non-recurring fair value [Member] |  |  |
Equity Investments [Line items] |  |  |
Unrealized gain | $ 0 | $ 0 | $ 12

X
- Definition Gains (losses) on equity securities without readily determinable fair value. + References No definition available. + Details
Name: | ava_GainsLossesOnEquitySecuritiesWithoutReadilyDeterminableFairValue
Namespace Prefix: | ava_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unrealized gains (losses) on equity securities without readily determinable fair value. + References No definition available. + Details
Name: | ava_UnrealizedGainsLossesOnEquitySecuritiesWithoutReadilyDeterminableFairValue
Namespace Prefix: | ava_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B + Details
Name: | us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |