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Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting [Abstract]      
Equity Method Investments $ 241   $ 246
Segment Reporting Information [Line Items]      
Electric 2,835 $ 2,685  
Net income 483 488  
Natural gas 1,055 941  
Other 16 23  
Regulated and Unregulated Operating Revenue 3,906 3,649  
Revenues Including Intersegment Revenues 3,895 3,628  
Equity Method Investments 241   246
Electric fuel and purchased power 1,020 948  
Cost of natural gas sold and transported 513 483  
Operating and maintenance expenses 686 605  
Utilities Operating Expense, Depreciation and Amortization 728 658  
Other income, net 7 14  
Interest and Debt Expense 309 277  
Interest Rate Derivatives, Tax (61) (27)  
Operating Segments      
Segment Reporting Information [Line Items]      
Net income 537 516  
Regulated Operating Revenue 3,890 3,626  
Electric fuel and purchased power 1,020 948  
Cost of natural gas sold and transported 513 483  
Operating and maintenance expenses 673 608  
Utilities Operating Expense, Depreciation and Amortization 724 655  
Other income, net 228 223  
Interest and Debt Expense 234 213  
Interest Rate Derivatives, Tax (34) (18)  
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Regulated Operating Revenue 5 2  
All Other      
Segment Reporting [Abstract]      
Equity Method Investments 156   161
Segment Reporting Information [Line Items]      
Net income (54) (28)  
Equity Method Investments 156   161
Regulated Electric Segment      
Segment Reporting Information [Line Items]      
Revenues Including Intersegment Revenues 2,835 2,686  
Regulated Electric Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Electric 2,835 2,685  
Net income 342 358  
Electric fuel and purchased power 1,020 948  
Cost of natural gas sold and transported 0 0  
Operating and maintenance expenses 567 503  
Utilities Operating Expense, Depreciation and Amortization 625 568  
Other income, net 172 190  
Interest and Debt Expense 204 186  
Interest Rate Derivatives, Tax (95) (67)  
Regulated Electric Segment | Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Electric 0 1  
Regulated Natural Gas Segment      
Segment Reporting [Abstract]      
Equity Method Investments 85   85
Segment Reporting Information [Line Items]      
Revenues Including Intersegment Revenues 1,060 942  
Equity Method Investments 85   $ 85
Regulated Natural Gas Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Net income 195 158  
Natural gas 1,055 941  
Electric fuel and purchased power 0 0  
Cost of natural gas sold and transported 513 483  
Operating and maintenance expenses 106 105  
Utilities Operating Expense, Depreciation and Amortization 99 87  
Other income, net 56 33  
Interest and Debt Expense 30 27  
Interest Rate Derivatives, Tax 61 49  
Regulated Natural Gas Segment | Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Natural gas $ 5 $ 1