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Revenue - Schedule of Utilities Operating Revenue Expense Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Utility-related taxes	$ 17	$ 17	$ 62	$ 60

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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