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Commitments And Contingencies (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 30, 2020
USD ($)
item
state
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2023
USD ($)
Commitments And Contingencies [Line Items]          
Accounts payable and accrued liabilities     $ 1,033   $ 1,103
Accounts payable     758   857,000
Vendor financing liabilities included in other current liabilities     16   $ 263
Vendor financing payments     463    
Capital expenditure associated with vendor financing payments     132    
Operating expenses related to vendor financing payments     $ 331    
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  
Chief Executive Officer, Frontier’s Predecessor Company [Member]          
Commitments And Contingencies [Line Items]          
Settlement agreement amount   $ 25      
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