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Committed Lines of Credit - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Apr. 30, 2014
Avista Utilities [Member]        
Short-term Debt [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 400,000,000.0   $ 400,000,000.0
Line of credit facility, expiration date 2026-06      
Line of credit facility additional expiration period   1 year    
Alaska Electric Light & Power [Member]        
Short-term Debt [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 25,000,000.0    
Line of credit facility, expiration date   2024-11    
Line of credit, outstanding   $ 0 $ 0