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Reportable Segments - Schedule of Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Revenues from external customers $ 2,920 $ 2,620  
Intersegment revenues 0    
Utility natural gas, fuel and purchased power 1,006 787  
Non-utility cost of revenues, including natural gas 1 1  
Operation and maintenance 747 709  
Depreciation and amortization 363 363  
Taxes other than income taxes 154 144  
Interest expense 238 204  
Income tax expense 81 78  
Interest income 6 0  
Other income(expense), net (39) 16  
Net income (loss) 297 350  
Interest income from securitization bonds (less than for 2025) 1 1  
Expenditures for Long-lived Assets 1,340 811  
Total Assets 44,486   $ 43,768
Natural Gas      
Segment Reporting Information [Line Items]      
Revenues from external customers 1,852 1,570  
Corporate and Other      
Segment Reporting Information [Line Items]      
Revenues from external customers 2 1  
Corporate and Other | Pension and Other Postretirement Plans Costs      
Segment Reporting Information [Line Items]      
Regulatory assets 378   384
Operating Segments      
Segment Reporting Information [Line Items]      
Revenues from external customers 2,920 2,620  
Intersegment revenues 1    
Utility natural gas, fuel and purchased power 1,007 787  
Non-utility cost of revenues, including natural gas 1 1  
Operation and maintenance 747 709  
Depreciation and amortization 363 363  
Taxes other than income taxes 154 144  
Interest expense 245 211  
Income tax expense 81 78  
Interest income 13 7  
Other income(expense), net (39) 16  
Net income (loss) 297 350  
Operating Segments | Electric      
Segment Reporting Information [Line Items]      
Revenues from external customers 1,066 1,049  
Intersegment revenues 0    
Utility natural gas, fuel and purchased power 74 43  
Non-utility cost of revenues, including natural gas 0 0  
Operation and maintenance 484 475  
Depreciation and amortization 210 226  
Taxes other than income taxes 78 78  
Interest expense 101 91  
Income tax expense 25 31  
Interest income 4 5  
Other income(expense), net 10 11  
Net income (loss) 108 121  
Expenditures for Long-lived Assets 971 507  
Total Assets 24,605   23,936
Operating Segments | Natural Gas      
Segment Reporting Information [Line Items]      
Revenues from external customers 1,852 1,570  
Intersegment revenues 1    
Utility natural gas, fuel and purchased power 933 744  
Non-utility cost of revenues, including natural gas 1 1  
Operation and maintenance 265 234  
Depreciation and amortization 147 132  
Taxes other than income taxes 74 65  
Interest expense 59 51  
Income tax expense 105 63  
Interest income 2 0  
Other income(expense), net (43) 3  
Net income (loss) 228 283  
Expenditures for Long-lived Assets 363 303  
Total Assets 18,299   18,583
Operating Segments | Corporate and Other      
Segment Reporting Information [Line Items]      
Revenues from external customers 2 1  
Intersegment revenues 0    
Utility natural gas, fuel and purchased power 0 0  
Non-utility cost of revenues, including natural gas 0 0  
Operation and maintenance (2) 0  
Depreciation and amortization 6 5  
Taxes other than income taxes 2 1  
Interest expense 85 69  
Income tax expense (49) (16)  
Interest income 7 2  
Other income(expense), net (6) 2  
Net income (loss) (39) (54)  
Expenditures for Long-lived Assets 6 1  
Total Assets 1,582   $ 1,249
Eliminations      
Segment Reporting Information [Line Items]      
Revenues from external customers 0 0  
Intersegment revenues (1)    
Utility natural gas, fuel and purchased power (1) 0  
Non-utility cost of revenues, including natural gas 0 0  
Operation and maintenance 0 0  
Depreciation and amortization 0 0  
Taxes other than income taxes 0 0  
Interest expense (7) (7)  
Income tax expense 0 0  
Interest income 7 7  
Other income(expense), net 0 0  
Net income (loss) $ 0 $ 0