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
Retail        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers $ 980 $ 955 $ 2,275 $ 2,291
Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 445 443 1,172 1,175
Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 522 499 1,078 1,089
Retail | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 13 13 25 27
Wholesale Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 49 51 110 113
Transmission Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 26 21 56 45
Other        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 53 48 114 102
Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 1,108 1,075 2,555 2,551
Alternative and Other [Member]        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 118 68 248 141
Regulated Electric | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 760 741 1,487 1,502
Regulated Electric | Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 299 301 627 630
Regulated Electric | Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 448 427 835 845
Regulated Electric | Retail | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 13 13 25 27
Regulated Electric | Wholesale Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 49 51 110 113
Regulated Electric | Transmission Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 26 21 56 45
Regulated Electric | Other        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 16 18 29 32
Regulated Electric | Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 851 831 1,682 1,692
Regulated Electric | Alternative and Other [Member]        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 107 60 214 122
Regulated Natural Gas | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 212 206 768 768
Regulated Natural Gas | Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 145 142 544 542
Regulated Natural Gas | Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 67 64 224 226
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 37 30 85 70
Regulated Natural Gas | Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 249 236 853 838
Regulated Natural Gas | Alternative and Other [Member]        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 11 8 34 19
All Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 8 8 20 21
All Other | Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 1 0 1 3
All Other | Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 7 8 19 18
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 20 21
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 1,226 1,143 2,803 2,692
Total revenues | Regulated Electric        
Disaggregation of Revenue [Line Items]        
Total revenues 958 891 1,896 1,814
Total revenues | Regulated Natural Gas        
Disaggregation of Revenue [Line Items]        
Total revenues 260 244 887 857
Total revenues | All Other        
Disaggregation of Revenue [Line Items]        
Total revenues $ 8 $ 8 $ 20 $ 21