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Segment Information - Schedule of Summarized Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Operating revenues $ 5,140 $ 4,684 $ 4,234
Operation and maintenance 2,019 1,858 1,720
Other segment items 280 250 227
Depreciation and amortization 894 788 704
Interest expense 615 523 460
Interest income (90) (94) (73)
Provision for (benefit from) income taxes 311 308 252
Net income attributable to common shareholders 1,111 1,051 944
Total assets 35,442 32,830 30,298
Capital expenditures 3,126 2,856 2,575
Operating Segments | Regulated Businesses      
Segment Reporting Information [Line Items]      
Operating revenues 4,723 4,296 3,920
Operation and maintenance 1,642 1,517 1,441
Other segment items 271 241 220
Depreciation and amortization 883 772 693
Interest expense 474 416 364
Interest income (5) (17) (28)
Provision for (benefit from) income taxes 321 302 259
Net income attributable to common shareholders 1,137 1,065 971
Total assets 32,649 29,941 27,480
Capital expenditures 3,112 2,838 2,551
Other      
Segment Reporting Information [Line Items]      
Operating revenues 417 388 314
Operation and maintenance 377 341 279
Other segment items 9 9 7
Depreciation and amortization 11 16 11
Interest expense 141 107 96
Interest income (85) (77) (45)
Provision for (benefit from) income taxes (10) 6 (7)
Net income attributable to common shareholders (26) (14) (27)
Total assets 2,793 2,889 2,818
Capital expenditures $ 14 $ 18 $ 24