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Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting [Abstract]          
Equity Method Investments $ 239   $ 239   $ 246
Segment Reporting Information [Line Items]          
Electric 3,638 $ 3,393 9,351 $ 8,737  
Natural gas 264 239 1,715 1,535  
Revenues Including Intersegment Revenues 3,910   11,085 10,274  
Electric fuel and purchased power 1,098 1,060 3,036 2,863  
Cost of natural gas sold and transported 61 63 708 664  
Operating and maintenance expenses 692 655 2,053 1,922  
Utilities Operating Expense, Depreciation and Amortization 750 681 2,200 2,042  
Other income, net 46 39 121 75  
Interest and Debt Expense 348 305 979 885  
Income tax (benefit) expense 8 10 (113) (105)  
Net income 524 682 1,451 1,472  
Equity Method Investments 239   239   246
Operating Segments          
Segment Reporting Information [Line Items]          
Regulated Operating Revenue 3,902 3,632 11,066 10,272  
Electric fuel and purchased power 1,098 1,060 3,036 2,863  
Cost of natural gas sold and transported 61 63 708 664  
Operating and maintenance expenses 687 640 2,020 1,902  
Utilities Operating Expense, Depreciation and Amortization 746 678 2,189 2,032  
Other income, net 471 211 882 614  
Interest and Debt Expense 259 227 737 668  
Income tax (benefit) expense 35 37 (51) (57)  
Net income 553 716 1,564 1,588  
Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Regulated Operating Revenue 8   19 2  
All Other          
Segment Reporting [Abstract]          
Equity Method Investments 149   149   161
Segment Reporting Information [Line Items]          
Net income (29) (34) (113) (116)  
Equity Method Investments 149   149   161
Regulated Electric Segment          
Segment Reporting Information [Line Items]          
Revenues Including Intersegment Revenues 3,638   9,351 8,738  
Regulated Electric Segment | Operating Segments          
Segment Reporting Information [Line Items]          
Electric 3,638 3,393 9,351 8,737  
Electric fuel and purchased power 1,098 1,060 3,036 2,863  
Cost of natural gas sold and transported 0 0 0 0  
Operating and maintenance expenses 582 540 1,704 1,596  
Utilities Operating Expense, Depreciation and Amortization 640 591 1,883 1,772  
Other income, net 443 197 770 547  
Interest and Debt Expense 228 198 645 582  
Income tax (benefit) expense 55 55 (88) (85)  
Net income 592 752 1,401 1,463  
Regulated Electric Segment | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Electric 0   0 1  
Regulated Natural Gas Segment          
Segment Reporting [Abstract]          
Equity Method Investments 90   90   85
Segment Reporting Information [Line Items]          
Revenues Including Intersegment Revenues 272   1,734 1,536  
Equity Method Investments 90   90   $ 85
Regulated Natural Gas Segment | Operating Segments          
Segment Reporting Information [Line Items]          
Natural gas 264 239 1,715 1,535  
Electric fuel and purchased power 0 0 0 0  
Cost of natural gas sold and transported 61 63 708 664  
Operating and maintenance expenses 105 100 316 306  
Utilities Operating Expense, Depreciation and Amortization 106 87 306 260  
Other income, net 28 14 112 67  
Interest and Debt Expense 31 29 92 86  
Income tax (benefit) expense (20) (18) 37 28  
Net income (39) $ (36) 163 125  
Regulated Natural Gas Segment | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Natural gas $ 8   $ 19 $ 1