v3.25.3
Goodwill and Intangible Assets - Goodwill and Non-amortizing Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Goodwill        
Balance at beginning, Goodwill   $ 746 $ 746  
Impairments, Goodwill $ (108) (108)    
Balance at beginning, Goodwill 638 638 746 $ 746
Total        
Balance at beginning   1,337    
Impairments (525) (525) 0 0
Balance at ending 812 812 1,337  
Accumulated goodwill impairment losses 108 108    
Cable Certificates        
Cable Certificates and Other        
Balance at beginning, Cable Certificates and Other   550    
Impairments, Cable Certificates and Other (401) $ (401)    
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]   Impairments    
Balance at ending, Cable Certificates and Other 149 $ 149 550  
Other        
Cable Certificates and Other        
Balance at beginning, Cable Certificates and Other   41 40  
Impairments, Cable Certificates and Other (16) $ (16)    
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]   Impairments    
Balance at ending, Cable Certificates and Other $ 25 $ 25 $ 41 $ 40