v3.25.2
Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Total revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 277 $ 267 $ 604 $ 577
Regulated Electric | Total revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 253 246 512 502
Regulated Natural Gas | Total revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 24 21 92 75
Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 217 206 480 455
Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 84 78 203 185
Retail | C&I        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 132 127 274 267
Retail | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1 1 3 3
Retail | Regulated Electric        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 195 186 392 383
Retail | Regulated Electric | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 71 66 152 143
Retail | Regulated Electric | C&I        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 123 119 237 237
Retail | Regulated Electric | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1 1 3 3
Retail | Regulated Natural Gas        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 22 20 88 72
Retail | Regulated Natural Gas | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 13 12 51 42
Retail | Regulated Natural Gas | C&I        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9 8 37 30
Retail | Regulated Natural Gas | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Interchange        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 59 59 119 115
Interchange | Regulated Electric        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 57 58 116 113
Interchange | Regulated Natural Gas        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2 1 3 2
Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 276 265 599 570
Total revenue from contracts with customers | Regulated Electric        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 252 244 508 496
Total revenue from contracts with customers | Regulated Natural Gas        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 24 21 91 74
Alternative revenue and other        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 1 2 5 7
Alternative revenue and other | Regulated Electric        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 1 2 4 6
Alternative revenue and other | Regulated Natural Gas        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other $ 0 $ 0 $ 1 $ 1