XML 175 R138.htm IDEA: XBRL DOCUMENT v3.25.0.1

Regulatory Matters - Schedule of Decoupling and Earnings Sharing Mechanisms (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
WASHINGTON | Decoupling Surcharge [Member]
Schedule of Decoupling and Earnings Sharing [Line Items]
Regulatory assets	$ 18
WASHINGTON | Decoupling Rebate [Member]
Schedule of Decoupling and Earnings Sharing [Line Items]
Regulatory Liabilities		$ (3)
IDAHO | Decoupling Surcharge [Member]
Schedule of Decoupling and Earnings Sharing [Line Items]
Regulatory assets	1
IDAHO | Revenue Subject to Refund [Member]
Schedule of Decoupling and Earnings Sharing [Line Items]
Regulatory Liabilities	0	(1)
IDAHO | Decoupling Rebate [Member]
Schedule of Decoupling and Earnings Sharing [Line Items]
Regulatory Liabilities		(8)
OREGON | Decoupling Surcharge [Member]
Schedule of Decoupling and Earnings Sharing [Line Items]
Regulatory assets	$ 1
OREGON | Decoupling Rebate [Member]
Schedule of Decoupling and Earnings Sharing [Line Items]
Regulatory Liabilities		$ (4)

X

- Definition

[Line Items] for Schedule of Decoupling and Earnings Sharing [Table]

+ References

No definition available.

+ Details

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

X

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478742/980-340-50-1

+ Details

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477571/980-405-25-1

+ Details

Name:	us-gaap_RegulatoryLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=stpr_WA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_RegulatoryLiabilityAxis=ava_DecouplingRebateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=stpr_ID
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RegulatoryLiabilityAxis=us-gaap_RevenueSubjectToRefundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=stpr_OR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: