v3.26.1
Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Retail        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers $ 910 $ 980 $ 2,115 $ 2,275
Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 405 445 1,036 1,172
Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 494 522 1,056 1,078
Retail | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 11 13 23 25
Wholesale Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 20 49 57 110
Transmission Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 29 26 60 56
Other        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 57 53 121 114
Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 1,016 1,108 2,353 2,555
Alternative and Other [Member]        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 199 118 381 248
Regulated Electric | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 731 760 1,459 1,487
Regulated Electric | Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 288 299 587 627
Regulated Electric | Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 432 448 849 835
Regulated Electric | Retail | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 11 13 23 25
Regulated Electric | Wholesale Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 20 49 57 110
Regulated Electric | Transmission Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 29 26 60 56
Regulated Electric | Other        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 17 16 34 29
Regulated Electric | Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 797 851 1,610 1,682
Regulated Electric | Alternative and Other [Member]        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 185 107 350 214
Regulated Natural Gas | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 171 212 637 768
Regulated Natural Gas | Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 116 145 448 544
Regulated Natural Gas | Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 55 67 189 224
Regulated Natural Gas | Retail | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0 0 0 0
Regulated Natural Gas | Wholesale Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0 0 0 0
Regulated Natural Gas | Transmission Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0 0 0 0
Regulated Natural Gas | Other        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 40 37 87 85
Regulated Natural Gas | Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 211 249 724 853
Regulated Natural Gas | Alternative and Other [Member]        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 14 11 31 34
All Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 8 8 19 20
All Other | Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 1 1 1 1
All Other | Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 7 7 18 19
All Other | Retail | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0 0 0 0
All Other | Wholesale Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0 0 0 0
All Other | Transmission Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0 0 0 0
All Other | Other        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0 0 0 0
All Other | Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 8 8 19 20
All Other | Alternative and Other [Member]        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 0 0 0 0
Total revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 1,215 1,226 2,734 2,803
Total revenues | Regulated Electric        
Disaggregation of Revenue [Line Items]        
Total revenues 982 958 1,960 1,896
Total revenues | Regulated Natural Gas        
Disaggregation of Revenue [Line Items]        
Total revenues 225 260 755 887
Total revenues | All Other        
Disaggregation of Revenue [Line Items]        
Total revenues $ 8 $ 8 $ 19 $ 20