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Commitments And Contingencies (Narrative) (Details)
$ in Millions
 9 Months Ended 12 Months Ended
Jan. 30, 2020
USD ($)
item
state
Sep. 30, 2025
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2024
USD ($)
Commitments And Contingencies [Line Items]        
Accounts payable and accrued liabilities   $ 1,249   $ 1,033
Accounts payable   971   $ 758
Capital expenditure associated with vendor financing payments   $ 16    
RDOF Program, Phase I [Member]        
Commitments And Contingencies [Line Items]        
Awarded amount $ 371      
Period to build gigabit capable broadband 10 years      
Number of location to build gigabit capable broadband | item 127,000      
Number of states to build gigabit capable broadband | state 8      
RDOF Program, Phase II [Member]        
Commitments And Contingencies [Line Items]        
Annual support offered by the Federal Communications Commission     $ 313  
Minimum [Member]        
Commitments And Contingencies [Line Items]        
Terms of lease arrangements   1 year    
Maximum [Member]        
Commitments And Contingencies [Line Items]        
Terms of lease arrangements   99 years    
Vendor financing liabilities included in other current liabilities   $ 0