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Short-Term Borrowings - Additional Information (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Avista Utilities [Member] |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 500,000,000 |
Line of credit facility, expiration date | 2028-06 |
Line of credit facility additional expiration period | 2 years |
Line of credit facility, covenant terms, maximum debt to equity ratio | 65.00% |
Average interest rate on borrowings | 6.13% | 6.46%
Letters of credit outstanding | $ 4,700,000 | $ 4,700,000
Avista Utilities [Member] | Letter of Credit [Member] |  |
Short-term Debt [Line Items] |  |
Principal amount | 50,000,000 |
Letters of credit outstanding | 7,000,000 | 20,000,000
Alaska Electric Light & Power [Member] |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 25,000,000 |
Line of credit facility, expiration date | 2028-06 |
Line of credit facility, covenant terms, maximum debt to equity ratio | 67.50% |
Average interest rate on borrowings | 7.30% |
Letters of credit outstanding | $ 4,300,000 | $ 0

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