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Goodwill - Schedule of Changes in Goodwill Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]      
Cost, beginning balance $ 3,584 $ 3,583  
Accumulated Impairment (2,440) (2,440) $ (2,440)
Total Net, beginning balance 1,144 1,143  
Goodwill from acquisitions 12 1  
Cost, ending balance 3,596 3,584  
Total Net, ending balance 1,156 1,144  
Operating Segments | Regulated Businesses      
Goodwill [Roll Forward]      
Cost, beginning balance 3,471 3,470  
Accumulated Impairment (2,332) (2,332) (2,332)
Goodwill from acquisitions 12 1  
Cost, ending balance 3,483 3,471  
Other      
Goodwill [Roll Forward]      
Cost, beginning balance 113 113  
Accumulated Impairment (108) (108) $ (108)
Goodwill from acquisitions 0 0  
Cost, ending balance $ 113 $ 113