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Summary Of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Millions	Sep. 30, 2019 USD ($)
AFUDC above FERC allowed rate (1)
Regulatory Assets [Line Items]
Reclassification of Prior Year Amounts to Comply with Regulatory Requirements	$ 37

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- Definition

Reclassification of Prior Year Amounts to Comply with Regulatory Requirements

+ References

No definition available.

+ Details

Name:	ava_ReclassificationofPriorYearAmountstoComplywithRegulatoryRequirements
Namespace Prefix:	ava_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- 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_RegulatoryAssetLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_RegulatoryAssetAxis=ava_AFUDCAboveFERCAllowedRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: