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Short-Term Borrowings - Additional Information (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Avista Utilities [Member] |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 500,000,000 |
Line of credit facility, expiration date | 2029-06 |
Line of credit facility, covenant terms, maximum debt to equity ratio | 65.00% |
Letters of credit outstanding | $ 5,000,000 | $ 5,000,000
Avista Utilities [Member] | Letter of Credit [Member] |  |
Short-term Debt [Line Items] |  |
Principal amount | 50,000,000 |
Letters of credit outstanding | 8,000,000 | $ 12,000,000
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% |

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