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Intangible Assets - Schedules (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2024
Licenses      
Loss on impairment of intangible assets $ (136) $ 0  
Finite-Lived Intangible Assets      
Gross Amount   290 $ 290
Accumulated Amortization   (106) (128)
Net Amount   183 161
Franchise rights      
Finite-Lived Intangible Assets      
Gross Amount   255 255
Accumulated Amortization   (102) (121)
Net Amount   153 134
Internet protocol addresses      
Finite-Lived Intangible Assets      
Gross Amount   34 34
Accumulated Amortization   (4) (7)
Net Amount   29 26
Other      
Finite-Lived Intangible Assets      
Gross Amount   1 1
Accumulated Amortization   0 0
Net Amount   $ 1 $ 1