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Derivatives and Risk Management - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) MMBTU MWh | Dec. 31, 2020 USD ($) MMBTU MWh
Canadian [Member] |  |
Derivative [Line Items] |  |
Number of days Canadian currency prices are settled with U.S. dollars | 60 days |
Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Letters of credit outstanding | $ | $ 0 | $ 0
Purchase [Member] | Physical [Member] | Electric Derivative [Member] |  |
Derivative [Line Items] |  |
Expected deliveries of energy commodity derivatives after five years | MWh | 0 |
Expected deliveries of energy commodity derivatives after three years | MWh |  | 0
Purchase [Member] | Physical [Member] | Gas Derivative [Member] |  |
Derivative [Line Items] |  |
Expected deliveries of energy commodity derivatives after five years | MMBTU | 0 |
Expected deliveries of energy commodity derivatives after three years | MMBTU |  | 0
Purchase [Member] | Financial [Member] | Electric Derivative [Member] |  |
Derivative [Line Items] |  |
Expected deliveries of energy commodity derivatives after five years | MWh | 0 |
Expected deliveries of energy commodity derivatives after three years | MWh |  | 0
Purchase [Member] | Financial [Member] | Gas Derivative [Member] |  |
Derivative [Line Items] |  |
Expected deliveries of energy commodity derivatives after five years | MMBTU | 0 |
Expected deliveries of energy commodity derivatives after three years | MMBTU |  | 0
Sales [Member] | Physical [Member] | Electric Derivative [Member] |  |
Derivative [Line Items] |  |
Expected deliveries of energy commodity derivatives after five years | MWh | 0 |
Expected deliveries of energy commodity derivatives after three years | MWh |  | 0
Sales [Member] | Physical [Member] | Gas Derivative [Member] |  |
Derivative [Line Items] |  |
Expected deliveries of energy commodity derivatives after five years | MMBTU | 0 |
Expected deliveries of energy commodity derivatives after three years | MMBTU |  | 0
Sales [Member] | Financial [Member] | Electric Derivative [Member] |  |
Derivative [Line Items] |  |
Expected deliveries of energy commodity derivatives after five years | MWh | 0 |
Expected deliveries of energy commodity derivatives after three years | MWh |  | 0
Sales [Member] | Financial [Member] | Gas Derivative [Member] |  |
Derivative [Line Items] |  |
Expected deliveries of energy commodity derivatives after five years | MMBTU | 0 |
Expected deliveries of energy commodity derivatives after three years | MMBTU |  | 0

X
- Definition Energy commodity derivative expected to be settle after year five. + References No definition available. + Details
Name: | ava_EnergyCommodityDerivativeExpectedToBeSettleAfterYearFive
Namespace Prefix: | ava_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Energy commodity derivative expected to be settle after year three. + References No definition available. + Details
Name: | ava_EnergyCommodityDerivativeExpectedToBeSettleAfterYearThree
Namespace Prefix: | ava_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of period currency prices are settled with domestic country currency. + References No definition available. + Details
Name: | ava_NumberOfPeriodCurrencyPricesAreSettledWithDomesticCountryCurrency
Namespace Prefix: | ava_
Data Type: | xbrli:durationItemType
Balance Type: | na
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 No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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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- Details
Name: | srt_StatementGeographicalAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=ava_PurchaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=ava_PhysicalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_EnergyAxis=ava_ElectricDerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_EnergyAxis=ava_GasDerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=ava_FinancialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |