v3.26.1
Segment Information - Summarized Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]              
Operating revenues $ 1,355   $ 1,276   $ 2,562 $ 2,418  
Operation and maintenance 481   480   974 948  
Other segment items 65   70   132 136  
Depreciation and amortization 240   221   477 437  
Interest expense 167   151   330 295  
Interest income (3)   (22)   (15) (44)  
Provision for (benefit from) income taxes 90   87   153 152  
Net income attributable to common shareholders 315 $ 196 289 $ 205 511 494  
Total assets 36,453   33,913   36,453 33,913 $ 35,442
Cash paid for capital expenditures 860   733   1,519 1,281  
Other              
Segment Reporting [Line Items]              
Operating revenues 87   98   183 191  
Operation and maintenance 72   74   148 147  
Other segment items (5)   2   (4) 1  
Depreciation and amortization 2   4   5 7  
Interest expense 40   35   77 65  
Interest income 0   (21)   (11) (42)  
Provision for (benefit from) income taxes (6)   3   (4) 8  
Net income attributable to common shareholders (16)   1   (28) 5  
Total assets 2,250   2,908   2,250 2,908  
Cash paid for capital expenditures 8   0   10 3  
Regulated Businesses | Operating Segments              
Segment Reporting [Line Items]              
Operating revenues 1,268   1,178   2,379 2,227  
Operation and maintenance 409   406   826 801  
Other segment items 70   68   136 135  
Depreciation and amortization 238   217   472 430  
Interest expense 127   116   253 230  
Interest income (3)   (1)   (4) (2)  
Provision for (benefit from) income taxes 96   84   157 144  
Net income attributable to common shareholders 331   288   539 489  
Total assets 34,203   31,005   34,203 31,005  
Cash paid for capital expenditures $ 852   $ 733   $ 1,509 $ 1,278