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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Alternative revenue programs $ 35 $ 5 $ (34)
Total utility revenues 1,937 1,751 1,709
Non-utility revenues 1 1 1
Total operating revenues 1,938 1,752 1,710
Residential Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 495 445 435
Commercial and Governmental Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 396 371 365
Industrial Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 131 110 108
Public Street and Highway Lighting Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 9 8 7
Retail Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 1,031 934 915
Transmission Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 38 33 32
Other Electric Revenues from Contracts With Customers [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 40 45 50
Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 1,109 1,012 997
Other Non-Reportable Segment Items [Member] | Other Revenues [Member]      
Disaggregation of Revenue [Line Items]      
Non-utility revenues 1 1 1
Avista Utilities [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 1,570 1,486 1,400
Derivative revenues 249 199 286
Alternative revenue programs 35 5 (34)
Other utility revenues 33 13 11
Total utility revenues 1,887 1,703 1,663
Avista Utilities [Member] | Residential Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 473 425 415
Avista Utilities [Member] | Commercial and Governmental Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 369 344 339
Avista Utilities [Member] | Industrial Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 131 110 108
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 9 8 7
Avista Utilities [Member] | Retail Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 982 887 869
Avista Utilities [Member] | Transmission Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 38 33 32
Avista Utilities [Member] | Other Electric Revenues from Contracts With Customers [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 40 45 50
Avista Utilities [Member] | Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 1,060 965 951
Avista Utilities [Member] | Residential Natural Gas [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 317 326 284
Avista Utilities [Member] | Commercial Natural Gas [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 163 164 140
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 13 17 10
Avista Utilities [Member] | Retail Natural Gas [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 493 507 434
Avista Utilities [Member] | Transportation Natural Gas [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 11 8 9
Avista Utilities [Member] | Other Natural Gas Revenues from Contracts With Customers [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 6 6 6
Avista Utilities [Member] | Natural Gas [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer including assessed tax 510 521 449
Alaska Electric Light & Power [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 49 47 46
Other utility revenues 1 1  
Total utility revenues 50 48 46
Alaska Electric Light & Power [Member] | Residential Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 22 20 20
Alaska Electric Light & Power [Member] | Commercial and Governmental Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 27 27 26
Alaska Electric Light & Power [Member] | Retail Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 49 47 46
Alaska Electric Light & Power [Member] | Electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers $ 49 $ 47 $ 46