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Information by Business Segments - Schedule of Business Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Operating revenues $ 1,938 $ 1,752 $ 1,710
Resource costs 798 702 736
Other operating expenses 444 417 417
Depreciation and amortization 274 265 253
Interest income 14 15 4
Interest expense 150 144 119
Other segment expense 103 102 51
Income tax expense (benefit) 3 (34) (17)
Net income (loss) 180 171 155
Capital expenditures 533 499 453
Total Assets 7,941 7,702 7,417
Operating Segments [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 1,937 1,751 1,709
Resource costs 798 702 736
Other operating expenses 443 414 405
Depreciation and amortization 274 265 253
Interest income 15 15 3
Interest expense 149 143 118
Other segment expense 96 98 100
Income tax expense (benefit) 5 (32) (25)
Net income (loss) 187 176 125
Capital expenditures 533 499 452
Total Assets 7,777 7,533 7,240
Operating Segments [Member] | Avista Utilities [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 1,887 1,703 1,663
Resource costs 794 698 732
Other operating expenses 426 399 391
Depreciation and amortization 263 254 242
Interest income 15 15 3
Interest expense 143 137 112
Other segment expense 95 98 98
Income tax expense (benefit) 2 (35) (27)
Net income (loss) 179 167 118
Capital expenditures 510 485 443
Total Assets 7,494 7,263 6,976
Operating Segments [Member] | Alaska Electric Light & Power [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 50 48 46
Resource costs 4 4 4
Other operating expenses 17 15 14
Depreciation and amortization 11 11 11
Interest income 0 0 0
Interest expense 6 6 6
Other segment expense 1 0 2
Income tax expense (benefit) 3 3 2
Net income (loss) 8 9 7
Capital expenditures 23 14 9
Total Assets 283 270 264
Other Non-Reportable Segment Items [Member] | Non-Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 1 1 1
Resource costs 0 0 0
Other operating expenses 1 3 12
Depreciation and amortization 0 0 0
Interest income 1 1 1
Interest expense 3 2 1
Other segment expense 7 4 (49)
Income tax expense (benefit) (2) (2) 8
Net income (loss) (7) (5) 30
Capital expenditures 0 0 1
Total Assets 194 191 187
Eliminations [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 0 0 0
Resource costs 0 0 0
Other operating expenses 0 0 0
Depreciation and amortization 0 0 0
Interest income (2) (1) 0
Interest expense (2) (1) 0
Other segment expense 0 0 0
Income tax expense (benefit) 0 0 0
Net income (loss) 0 0 0
Capital expenditures 0 0 0
Total Assets $ (30) $ (22) $ (10)