v3.26.3
Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 3,451 $ 3,274 $ 9,196 $ 9,264
Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 153 205 459 556
Transmission        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 221 200 597 541
Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 61 55 180 190
Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,886 3,734 10,432 10,551
Alternative revenue and other        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 286 181 880 557
Residential | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,522 1,395 4,027 4,045
C&I | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,887 1,837 5,057 5,100
Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 42 42 112 119
Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues 4,172 3,915 11,312 11,108
Regulated Electric | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,229 3,050 7,718 7,735
Regulated Electric | Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 153 205 459 556
Regulated Electric | Transmission        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 221 200 597 541
Regulated Electric | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 21 22 46 61
Regulated Electric | Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,624 3,477 8,820 8,893
Regulated Electric | Alternative revenue and other        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 264 161 784 458
Regulated Electric | Residential | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,389 1,260 3,096 3,065
Regulated Electric | C&I | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,798 1,750 4,514 4,557
Regulated Electric | Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 42 40 108 113
Regulated Electric | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues 3,888 3,638 9,604 9,351
Regulated Natural Gas | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 213 215 1,448 1,498
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 40 33 134 129
Regulated Natural Gas | Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 253 248 1,582 1,627
Regulated Natural Gas | Alternative revenue and other        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 19 16 85 88
Regulated Natural Gas | Residential | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 132 133 928 977
Regulated Natural Gas | C&I | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 81 82 520 521
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 272 264 1,667 1,715
All Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9 9 30 31
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 30 31
All Other | Alternative revenue and other        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 3 4 11 11
All Other | Residential | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1 2 3 3
All Other | C&I | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8 5 23 22
All Other | Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 2 4 6
All Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues $ 12 $ 13 $ 41 $ 42