XML 66 R45.htm IDEA: XBRL DOCUMENT v3.25.3
Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Alternative revenue programs $ (8) $ 4 $ (4) $ 23
Total operating revenues 403 394 1,431 1,405
Residential Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 136 114 424 360
Commercial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 112 104 321 296
Industrial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 38 37 108 95
Public Street and Highway Lighting Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 2 2 7 7
Retail Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 288 257 860 758
Transmission Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 7 9 23 28
Other Electric Revenues from Contracts With Customers [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 7 8 21 32
Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 302 274 904 818
Avista Utilities [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 344 318 1,200 1,137
Derivative revenues 53 57 166 195
Alternative revenue programs (8) 4 (4) 23
Deferrals and amortizations for rate refunds to customers 0 0 (2) 0
Other utility revenues 5 5 38 15
Total utility revenues 394 384 1,398 1,370
Avista Utilities [Member] | Residential Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 133 110 409 345
Avista Utilities [Member] | Commercial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 106 98 303 276
Avista Utilities [Member] | Industrial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 38 37 108 95
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 2 2 7 7
Avista Utilities [Member] | Retail Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 279 247 827 723
Avista Utilities [Member] | Transmission Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 7 9 23 28
Avista Utilities [Member] | Other Electric Revenues from Contracts With Customers [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 7 8 21 32
Avista Utilities [Member] | Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 293 264 871 783
Avista Utilities [Member] | Residential Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 29 30 203 218
Avista Utilities [Member] | Commercial Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 14 17 101 114
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 2 3 9 10
Avista Utilities [Member] | Retail Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 45 50 313 342
Avista Utilities [Member] | Transportation Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 3 3 9 8
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 3 1 7 4
Avista Utilities [Member] | Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 51 54 329 354
Alaska Electric Light & Power [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9 10 33 35
Alaska Electric Light & Power [Member] | Residential Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3 4 15 15
Alaska Electric Light & Power [Member] | Commercial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 6 6 18 20
Alaska Electric Light & Power [Member] | Industrial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Alaska Electric Light & Power [Member] | Public Street and Highway Lighting Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Alaska Electric Light & Power [Member] | Retail Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9 10 33 35
Alaska Electric Light & Power [Member] | Transmission Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Alaska Electric Light & Power [Member] | Other Electric Revenues from Contracts With Customers [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Alaska Electric Light & Power [Member] | Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 9 $ 10 $ 33 $ 35