v3.26.1
Revenues (Details) - Regulated Electric - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 382 $ 498 $ 904 $ 1,013
Total revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 389 508 919 1,029
Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 275 396 682 809
Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 71 95 169 209
Retail | C&I        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 194 [1] 289 [1] 492 577
Retail | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 10 12 21 23
Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 19 23 49 48
Transmission        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 86 78 170 154
Alternative and Other        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 7 10 15 16
Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 2 $ 1 $ 3 $ 2
[1] For the three months ended June 30, 2026 and 2025, revenues from one C&I customer represented approximately 10.2% and 10.1% of total revenues, respectively.