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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%