v3.26.3
Segment Information - Summarized Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]                  
Operating revenues $ 1,510     $ 1,451     $ 4,072 $ 3,869  
Operation and maintenance 531     523     1,505 1,471  
Other segment items 71     73     203 209  
Depreciation and amortization 245     226     722 663  
Interest expense 167     158     497 453  
Interest income (3)     (23)     (18) (67)  
Provision for (benefit from) income taxes 112     115     265 267  
Net income (loss) attributable to common shareholders 387 $ 315 $ 196 379 $ 289 $ 205 898 873  
Total assets 37,227     34,748     37,227 34,748 $ 35,442
Cash paid for capital expenditures 888     797     2,407 2,078  
Other                  
Segment Reporting [Line Items]                  
Operating revenues 107     108     290 299  
Operation and maintenance 91     90     239 237  
Other segment items 3     3     (1) 4  
Depreciation and amortization 3     2     8 9  
Interest expense 36     36     113 101  
Interest income (2)     (22)     (13) (64)  
Provision for (benefit from) income taxes (4)     3     (8) 11  
Net income (loss) attributable to common shareholders (20)     (4)     (48) 1  
Total assets 2,091     2,874     2,091 2,874  
Cash paid for capital expenditures 9     5     19 8  
Regulated Businesses | Operating Segments                  
Segment Reporting [Line Items]                  
Operating revenues 1,403     1,343     3,782 3,570  
Operation and maintenance 440     433     1,266 1,234  
Other segment items 68     70     204 205  
Depreciation and amortization 242     224     714 654  
Interest expense 131     122     384 352  
Interest income (1)     (1)     (5) (3)  
Provision for (benefit from) income taxes 116     112     273 256  
Net income (loss) attributable to common shareholders 407     383     946 872  
Total assets 35,136     31,874     35,136 31,874  
Cash paid for capital expenditures $ 879     $ 792     $ 2,388 $ 2,070