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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 |

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