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Reportable Segments - Schedule of Financial Data (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenues $ 8,643 $ 8,696 $ 9,321
Intersegment revenues 0 0  
Utility natural gas, fuel and purchased power 1,715 2,061 2,887
Non-utility cost of revenues, including natural gas 3 99 204
Operation and maintenance expenses 2,949 2,850 2,833
Depreciation and amortization 1,439 1,401 1,288
Taxes other than income taxes 547 525 543
Interest expense 838 701 524
Income tax expense (benefit) 195 170 360
Interest income 7 9 4
Other income, net 55 19 371
Net Income 1,019 917 1,057
Interest income from securitization bonds 3 4 1
Total Assets 43,768 39,715  
Expenditures for Long-lived Assets 4,649 4,370 4,418
Total Regulatory Assets 3,347 2,674  
Continuing Operations      
Segment Reporting Information [Line Items]      
Total Assets 43,768 39,715  
Expenditures for Long-lived Assets 4,649 4,370 4,415
Divestitures      
Segment Reporting Information [Line Items]      
Total Assets 0 0  
Expenditures for Long-lived Assets 0 0 3
Natural Gas      
Segment Reporting Information [Line Items]      
Revenues 4,046 4,276 4,946
Corporate and Other      
Segment Reporting Information [Line Items]      
Revenues 7 130 267
Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 8,643 8,696 9,321
Intersegment revenues 2 3  
Utility natural gas, fuel and purchased power 1,717 2,064 2,887
Non-utility cost of revenues, including natural gas 3 99 204
Operation and maintenance expenses 2,949 2,850 2,833
Depreciation and amortization 1,439 1,401 1,288
Taxes other than income taxes 547 525 543
Interest expense 865 755 586
Income tax expense (benefit) 195 170 360
Interest income 34 63 66
Other income, net 55 19 371
Net Income 1,019 917 1,057
Operating Segments | Electric      
Segment Reporting Information [Line Items]      
Revenues 4,590 4,290 4,108
Intersegment revenues 0 0  
Utility natural gas, fuel and purchased power 198 176 222
Non-utility cost of revenues, including natural gas 0 0 0
Operation and maintenance expenses 2,072 1,880 1,864
Depreciation and amortization 877 872 793
Taxes other than income taxes 304 272 275
Interest expense 372 303 235
Income tax expense (benefit) 157 189 147
Interest income 18 19 4
Other income, net 43 37 27
Net Income 671 654 603
Total Assets 23,936 21,089  
Expenditures for Long-lived Assets 3,099 2,660 2,611
Operating Segments | Natural Gas      
Segment Reporting Information [Line Items]      
Revenues 4,048 4,276 4,946
Intersegment revenues 2 3  
Utility natural gas, fuel and purchased power 1,520 1,888 2,665
Non-utility cost of revenues, including natural gas 3 3 4
Operation and maintenance expenses 881 949 919
Depreciation and amortization 542 513 466
Taxes other than income taxes 237 245 261
Interest expense 207 188 137
Income tax expense (benefit) 108 (25) 243
Interest income 2 10 2
Other income, net 12 5 239
Net Income 566 533 492
Total Assets 18,583 17,429  
Expenditures for Long-lived Assets 1,524 1,697 1,697
Operating Segments | Corporate and Other      
Segment Reporting Information [Line Items]      
Revenues 5 130 267
Intersegment revenues 0 0  
Utility natural gas, fuel and purchased power (1) 0 0
Non-utility cost of revenues, including natural gas 0 96 200
Operation and maintenance expenses (4) 21 50
Depreciation and amortization 20 16 29
Taxes other than income taxes 6 8 7
Interest expense 286 264 214
Income tax expense (benefit) (70) 6 (30)
Interest income 14 34 60
Other income, net 0 (23) 105
Net Income (218) (270) (38)
Total Assets 1,249 1,197  
Expenditures for Long-lived Assets 26 13 107
Eliminations      
Segment Reporting Information [Line Items]      
Revenues 0 0 0
Intersegment revenues (2) (3)  
Utility natural gas, fuel and purchased power (2) (3) 0
Non-utility cost of revenues, including natural gas 0 0 0
Operation and maintenance expenses 0 0 0
Depreciation and amortization 0 0 0
Taxes other than income taxes 0 0 0
Interest expense (27) (54) (62)
Income tax expense (benefit) 0 0 0
Interest income 27 54 62
Other income, net 0 0 0
Net Income 0 0 $ 0
Benefit obligations | Corporate and Other      
Segment Reporting Information [Line Items]      
Total Regulatory Assets $ 384 $ 385