v3.26.3
Revenues (Details) - Regulated Electric - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 729 $ 645 $ 1,633 $ 1,658
Total revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 738 655 1,657 1,684
Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 608 528 1,290 1,337
Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 204 153 373 362
Retail | C&I        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 385 359 877 936
Retail | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 19 16 40 39
Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 27 33 76 81
Transmission        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 93 84 263 238
Alternative and Other        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 9 10 24 26
Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 1 $ 0 $ 4 $ 2