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Segments and Related Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Investment in subsidiaries $ 244 $ 219  
Regulated Electric 11,446 12,123 $ 11,205
Natural Gas 2,645 3,080 2,132
Other 115 107 94
Regulated and Unregulated Operating Revenue 14,206 15,310 13,431
Depreciation and amortization 2,448 2,413 2,121
Interest charges and financing costs 1,004 925 816
Total income tax benefit (146) (135) (70)
Net income (loss) 1,771 1,736 1,597
Regulated Electric      
Segment Reporting Information [Line Items]      
Revenues Including Intersegment Revenues 11,448 12,125 11,207
Depreciation and amortization 2,111 2,122 1,855
Interest charges and financing costs 670 636 568
Total income tax benefit (135) (162) (96)
Net income (loss) 1,686 1,631 1,478
Regulated Natural Gas      
Segment Reporting Information [Line Items]      
Revenues Including Intersegment Revenues 2,648 3,082 2,134
Depreciation and amortization 323 276 254
Interest charges and financing costs 96 86 75
Total income tax benefit 50 68 54
Net income (loss) 219 264 231
All Other      
Segment Reporting Information [Line Items]      
Depreciation and amortization 14 15 12
Interest charges and financing costs 238 203 173
Total income tax benefit (61) (41) (28)
Net income (loss) (134) (159) (112)
Total revenues      
Segment Reporting Information [Line Items]      
Regulated and Unregulated Operating Revenue 14,211 15,314 13,435
Total revenues | Regulated Electric      
Segment Reporting Information [Line Items]      
Regulated Electric 11,446 12,123 11,205
Total revenues | Regulated Natural Gas      
Segment Reporting Information [Line Items]      
Natural Gas 2,645 3,080 2,132
Total revenues | All Other      
Segment Reporting Information [Line Items]      
Other 115 107 94
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Regulated and Unregulated Operating Revenue (5) (4) (4)
Intersegment Eliminations | Regulated Electric      
Segment Reporting Information [Line Items]      
Regulated Electric 2 2 2
Intersegment Eliminations | Regulated Natural Gas      
Segment Reporting Information [Line Items]      
Natural Gas $ 3 $ 2 $ 2