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 $ 2,456 $ 2,733 $ 5,745 $ 5,990
Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 89 145 306 351
Transmission        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 190 169 376 341
Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 57 67 119 135
Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,792 3,114 6,546 6,817
Alternative revenue and other        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 327 173 594 376
Residential | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 988 1,093 2,505 2,650
C&I | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,435 1,600 3,170 3,263
Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 33 40 70 77
Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues 3,119 3,287 7,140 7,193
Regulated Electric | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,158 2,393 4,489 4,685
Regulated Electric | Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 89 145 306 351
Regulated Electric | Transmission        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 190 169 376 341
Regulated Electric | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 13 22 25 39
Regulated Electric | Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,450 2,729 5,196 5,416
Regulated Electric | Alternative revenue and other        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 290 149 520 297
Regulated Electric | Residential | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 803 881 1,707 1,805
Regulated Electric | C&I | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,324 1,474 2,716 2,807
Regulated Electric | Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 31 38 66 73
Regulated Electric | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues 2,740 2,878 5,716 5,713
Regulated Natural Gas | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 289 331 1,235 1,283
Regulated Natural Gas | Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Regulated Natural Gas | Transmission        
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 44 45 94 96
Regulated Natural Gas | Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 333 376 1,329 1,379
Regulated Natural Gas | Alternative revenue and other        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 32 20 66 72
Regulated Natural Gas | Residential | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 184 212 796 844
Regulated Natural Gas | C&I | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 105 119 439 439
Regulated Natural Gas | Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Regulated Natural Gas | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues 365 396 1,395 1,451
All Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9 9 21 22
All Other | Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
All Other | Transmission        
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 9 9 21 22
All Other | Alternative revenue and other        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 5 4 8 7
All Other | Residential | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1 0 2 1
All Other | C&I | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 6 7 15 17
All Other | Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2 2 4 4
All Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues $ 14 $ 13 $ 29 $ 29