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Information by Business Segments - Schedule of Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Operating revenues $ 403 $ 394 $ 1,431 $ 1,405  
Resource costs 115 142 501 579  
Other operating expenses 128 107 381 329  
Depreciation and amortization 73 68 216 204  
Interest income 4 3 9 13  
Interest expense 39 37 115 112  
Other segment expenses 21 25 90 79  
Income tax expense (benefit) 2 0 15 2  
Net income (loss) 29 18 122 113  
Capital expenditures 133 154 379 405  
Total Assets 8,162   8,162   $ 7,941
Operating Segments [Member] | Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 403 394 1,431 1,405  
Resource costs 115 142 501 579  
Other operating expenses 125 107 377 328  
Depreciation and amortization 73 68 216 204  
Interest income 4 4 10 13  
Interest expense 40 37 115 111  
Other segment expenses 22 24 79 77  
Income tax expense (benefit) 2 0 18 3  
Net income (loss) 30 20 135 116  
Capital expenditures 133 154 379 405  
Total Assets 8,005   8,005   7,777
Operating Segments [Member] | Avista Utilities [Member] | Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 394 384 1,398 1,370  
Resource costs 115 141 500 576  
Other operating expenses 120 103 364 316  
Depreciation and amortization 70 65 207 195  
Interest income 4 4 10 13  
Interest expense 38 36 110 107  
Other segment expenses 22 23 79 77  
Income tax expense (benefit) 3 0 17 1  
Net income (loss) 30 20 131 111  
Capital expenditures 127 144 363 389  
Total Assets 7,713   7,713   7,494
Operating Segments [Member] | Alaska Electric Light & Power [Member] | Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 9 10 33 35  
Resource costs 0 1 1 3  
Other operating expenses 5 4 13 12  
Depreciation and amortization 3 3 9 9  
Interest income 0 0 0 0  
Interest expense 2 1 5 4  
Other segment expenses 0 1 0 0  
Income tax expense (benefit) (1) 0 1 2  
Net income (loss) 0 0 4 5  
Capital expenditures 6 10 16 16  
Total Assets 292   292   283
Other Non-Reportable Segment Items [Member] | Non-Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 0 0 0 0  
Resource costs 0 0 0 0  
Other operating expenses 3 0 4 1  
Depreciation and amortization 0 0 0 0  
Interest income 1 0 1 1  
Interest expense 0 1 2 2  
Other segment expenses (1) 1 11 2  
Income tax expense (benefit) (0) 0 (3) (1)  
Net income (loss) (1) (2) (13) (3)  
Capital expenditures 0 0 0 0  
Total Assets 189   189   194
Eliminations [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 0 0 0 0  
Resource costs 0 0 0 0  
Other operating expenses 0 0 0 0  
Depreciation and amortization 0 0 0 0  
Interest income (1) (1) (2) (1)  
Interest expense (1) (1) (2) (1)  
Other segment expenses 0 0 0 0  
Income tax expense (benefit) 0 0 0 0  
Net income (loss) 0 0 0 0  
Capital expenditures 0 $ 0 0 $ 0  
Total Assets $ (32)   $ (32)   $ (30)