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Energy Purchase Contracts (Schedule Of Utility Total Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Energy Purchase Contracts [Abstract]
Utility power resources	$ 548	$ 607	$ 661

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- Definition

Energy Purchase Contracts

+ References

No definition available.

+ Details

Name:	ava_EnergyPurchaseContractsAbstract
Namespace Prefix:	ava_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The total amount of power purchased, natural gas purchased, fuel for generation and other fuel costs, which are included in utility resource costs in the Consolidated Statements of Income

+ References

No definition available.

+ Details

Name:	ava_UtilityPowerResources
Namespace Prefix:	ava_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration