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Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Revenues $ 1,856 $ 1,860 $ 6,381 $ 6,514  
Net Income (Loss) 193 282 771 725  
Total Assets 42,893   42,893   $ 39,715
Natural Gas          
Segment Reporting Information [Line Items]          
Revenues 611 597 2,876 3,136  
Corporate and Other          
Segment Reporting Information [Line Items]          
Revenues 2 2 6 128  
Corporate and Other | Pension and Other Postretirement Plans Costs          
Segment Reporting Information [Line Items]          
Regulatory assets 368   368   385
Operating Segments | Electric          
Segment Reporting Information [Line Items]          
Revenues 1,243 1,261 3,499 3,250  
Net Income (Loss) 226 290 562 593  
Total Assets 23,458   23,458   21,089
Operating Segments | Natural Gas          
Segment Reporting Information [Line Items]          
Revenues 611 597 2,876 3,136  
Net Income (Loss) 30 27 360 296  
Total Assets 17,966   17,966   17,429
Operating Segments | Corporate and Other          
Segment Reporting Information [Line Items]          
Revenues 2 2 6 128  
Net Income (Loss) (63) $ (35) (151) $ (164)  
Total Assets $ 1,469   $ 1,469   $ 1,197