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Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Revenues $ 2,620 $ 2,779  
Net income 350 325  
Total Assets 40,199   $ 39,715
Natural Gas      
Segment Reporting Information [Line Items]      
Revenues 1,570 1,775  
Corporate and Other      
Segment Reporting Information [Line Items]      
Revenues 1 52  
Corporate and Other | Pension and Other Postretirement Plans Costs      
Segment Reporting Information [Line Items]      
Regulatory assets 379   385
Operating Segments | Electric      
Segment Reporting Information [Line Items]      
Revenues 1,049 952  
Net income 121 123  
Total Assets 21,688   21,089
Operating Segments | Natural Gas      
Segment Reporting Information [Line Items]      
Revenues 1,570 1,775  
Net income 283 234  
Total Assets 17,611   17,429
Operating Segments | Corporate and Other      
Segment Reporting Information [Line Items]      
Revenues 1 52  
Net income (54) $ (32)  
Total Assets $ 900   $ 1,197