Short-Term Borrowings (Tables) |
9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Avista Utilities [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line of Credit Facility [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Balances Outstanding and Interest Rates of Borrowings | Balances outstanding and interest rates on borrowings (excluding letters of credit) under Avista Corp.’s revolving committed line of credit were as follows as of September 30, 2026 and December 31, 2025 (dollars in millions):
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Alaska Electric Light & Power [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line of Credit Facility [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Balances Outstanding and Interest Rates of Borrowings | Balances outstanding and interest rates on borrowings under AEL&P’s revolving committed line of credit were as follows as of September 30, 2026 and December 31, 2025 (dollars in millions):
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||