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Common Stock - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Class Of Stock [Line Items] |  |  |
Preferred stock, shares outstanding | 0 | 0 |
Amount available for dividend distribution without affecting covenants | $ 326 |  |
Preferred stock, shares authorized | 10,000,000 |  |
Proceeds from issuance of common stock | $ 68 | $ 113 | $ 137
Common Stock [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Shares issued through sales agency agreements | 1,804,000 | 2,999,000 | 3,310,000
Avista Utilities [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Regulatory restrictions, maximum debt to equity | 40.00% |  |

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