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Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Total revenue from contracts with customers      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers $ 13,591 $ 14,708 $ 12,668
Total revenue from contracts with customers | Regulated Electric      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 10,940 11,623 10,576
Total revenue from contracts with customers | Natural Gas      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 2,549 2,990 2,010
Total revenue from contracts with customers | All Other      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 102 95 82
Retail      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 11,908 12,404 10,315
Retail | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 5,179 5,409 4,461
Retail | C&I      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 6,566 6,837 5,720
Retail | Other      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 163 158 134
Retail | Regulated Electric      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 9,413 9,497 8,371
Retail | Regulated Electric | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 3,560 3,542 3,194
Retail | Regulated Electric | C&I      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 5,703 5,807 5,050
Retail | Regulated Electric | Other      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 150 148 127
Retail | Natural Gas      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 2,393 2,812 1,862
Retail | Natural Gas | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 1,560 1,814 1,222
Retail | Natural Gas | C&I      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 833 998 640
Retail | Natural Gas | Other      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0 0
Retail | All Other      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 102 95 82
Retail | All Other | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 59 53 45
Retail | All Other | C&I      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 30 32 30
Retail | All Other | Other      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 13 10 7
Wholesale      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 815 1,354 1,540
Wholesale | Regulated Electric      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 815 1,354 1,540
Wholesale | Natural Gas      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0 0
Wholesale | All Other      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0 0
Transmission      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 649 675 604
Transmission | Regulated Electric      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 649 675 604
Transmission | Natural Gas      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0 0
Transmission | All Other      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0 0
Other      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 219 275 209
Other | Regulated Electric      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 63 97 61
Other | Natural Gas      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 156 178 148
Other | All Other      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0 0
Alternative revenue and other      
Disaggregation of Revenue [Line Items]      
Alternative revenue and other 615 602 763
Alternative revenue and other | Regulated Electric      
Disaggregation of Revenue [Line Items]      
Alternative revenue and other 506 500 629
Alternative revenue and other | Natural Gas      
Disaggregation of Revenue [Line Items]      
Alternative revenue and other 96 90 122
Alternative revenue and other | All Other      
Disaggregation of Revenue [Line Items]      
Alternative revenue and other 13 12 12
Total revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 14,206 15,310 13,431
Total revenues | Regulated Electric      
Disaggregation of Revenue [Line Items]      
Total revenues 11,446 12,123 11,205
Total revenues | Natural Gas      
Disaggregation of Revenue [Line Items]      
Total revenues 2,645 3,080 2,132
Total revenues | All Other      
Disaggregation of Revenue [Line Items]      
Total revenues $ 115 $ 107 $ 94