XML 54 R43.htm IDEA: XBRL DOCUMENT v3.25.3
Summary Of Significant Accounting Policies (Narrative) (Details)
customer in Millions, $ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
employee
state
segment
customer
Dec. 31, 2024
USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items]    
Number of Reportable Segments | segment 1  
Number of subscribers | customer 3.3  
Number of states of operation | state 25  
Annual support accepted for commitment for RDOF $ 37  
Number of employees | employee 12,700  
Letter of credit issued, amount included in other assets $ 55 $ 57
Restricted cash $ 91 $ 161
Restricted Cash, Statement of Financial Position [Extensible Enumeration] Cash and cash equivalents Cash and cash equivalents
Short-term Investments $ 0 $ 0
Revenue recognition period, FCC's CAF Phase II subsidies 7 years  
Provided funding period, for construction of broadband networks 10 years  
Remaining outstanding principal $ 12,044 11,569
Securitization Trust Accounts [Member]    
Description Of Business And Summary Of Significant Accounting Policies [Line Items]    
Restricted cash, current 84 56
Restricted cash, noncurrent 7 $ 105
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  
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