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Description of Business and Summary of Significant Accounting Policies (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
employee
state
item
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Number of subscribers | item   3,100,000    
Number of states of operation | state   25    
Annual support accepted for commitment for RDOF   $ 37    
Number of employees | employee   13,000    
Letter of credit issued, amount included in other assets   $ 57   $ 62
Restricted cash   161   114
Short-term Investments     1,075
Lease Impairment $ 44 $ 44  
Revenue recognition period, FCC's CAF Phase II subsidies   7 years    
Provided funding period, for construction of broadband networks   10 years    
Remaining outstanding principal   $ 11,569   11,231
Number of stock plans | item   1    
Securitization Trust Accounts [Member]        
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Restricted cash, current   $ 56   42
Restricted cash, noncurrent   105   72
US Treasuries In Trust Account [Member]        
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Restricted cash   63    
Debt On Frontier Southwest Properties [Member]        
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Remaining outstanding principal   $ 47   $ 47
Business And Wholesale [Member] | Minimum [Member]        
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Useful life   11 years    
Business And Wholesale [Member] | Maximum [Member]        
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Useful life   16 years    
Trademarks and Tradenames [Member]        
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Useful life   5 years