XML 58 R33.htm IDEA: XBRL DOCUMENT
v3.21.2

Long- Term Debt to Affiliated Trust (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
Long Term Debt To Affiliated Trust [Abstract] |
Schedule Of Distribution Rates Paid | The distribution rates paid were as follows during the nine months ended September 30, 2021 and the year ended December 31, 2020:
|  | September 30, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Low distribution rate |  |  | 0.99 | % |  |  | 1.10 | %
High distribution rate |  |  | 1.10 | % |  |  | 2.79 | %
Distribution rate at the end of the period |  |  | 0.99 | % |  |  | 1.10 | %

X
- Definition Long-Term Debt to Affiliated Trust [Abstract] + References No definition available. + Details
Name: | ava_LongTermDebtToAffiliatedTrustAbstract
Namespace Prefix: | ava_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Distribution Rates Paid [Table Text Block] + References No definition available. + Details
Name: | ava_ScheduleOfDistributionRatesPaidTableTextBlock
Namespace Prefix: | ava_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration