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 $ 1,166 $ 1,135 $ 3,281 $ 3,410
Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 575 541 1,611 1,713
Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 580 582 1,636 1,660
Retail | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 11 12 34 37
Wholesale Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 25 62 82 172
Transmission Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 36 37 96 93
Other        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 55 48 176 162
Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 1,282 1,282 3,635 3,837
Alternative and Other [Member]        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 188 118 569 366
Regulated Electric | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 1,027 989 2,486 2,476
Regulated Electric | Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 489 450 1,076 1,077
Regulated Electric | Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 527 527 1,376 1,362
Regulated Electric | Retail | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 11 12 34 37
Regulated Electric | Wholesale Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 25 62 82 172
Regulated Electric | Transmission Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 36 37 96 93
Regulated Electric | Other        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 19 14 53 43
Regulated Electric | Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 1,107 1,102 2,717 2,784
Regulated Electric | Alternative and Other [Member]        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 175 107 525 321
Regulated Natural Gas | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 131 138 768 906
Regulated Natural Gas | Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 86 91 534 635
Regulated Natural Gas | Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 45 47 234 271
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 36 34 123 119
Regulated Natural Gas | Total revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 167 172 891 1,025
Regulated Natural Gas | Alternative and Other [Member]        
Disaggregation of Revenue [Line Items]        
Alternative revenue and other 13 11 44 45
All Other | Retail        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 8 8 27 28
All Other | Retail | Residential        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0 0 1 1
All Other | Retail | Commercial and Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 8 8 26 27
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 27 28
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 1,470 1,400 4,204 4,203
Total revenues | Regulated Electric        
Disaggregation of Revenue [Line Items]        
Total revenues 1,282 1,209 3,242 3,105
Total revenues | Regulated Natural Gas        
Disaggregation of Revenue [Line Items]        
Total revenues 180 183 935 1,070
Total revenues | All Other        
Disaggregation of Revenue [Line Items]        
Total revenues $ 8 $ 8 $ 27 $ 28