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Other Financial Information - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Other Current Assets [Line Items]        
Capital expenditures included in accounts payable   $ 138   $ 248
Gain on sale of investment $ 205 0 $ 205  
Held for sale | Mass Markets Fiber-to-the Home Business        
Other Current Assets [Line Items]        
Accounts payable   $ 75