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Long-Term Debt (Narrative) (Details) - USD ($) |  |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 18, 2025 | Jan. 14, 2025 | Jul. 01, 2024 | May 22, 2024 | Sep. 30, 2025 | Dec. 31, 2024 | Jul. 30, 2024
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  | 6.774% | 6.996% |
Repayment of debt |  |  |  |  | $ 5,000,000 |  |
Frontier Holdings [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  |  |  |  | $ 925,000,000 |  | $ 900,000,000
Maturity date description |  |  |  |  | The maturity date of the Revolving Facility will be the earliest of (a) April 30, 2028, (b) 91 days prior to the maturity of the term loan facility, (c) unless such notes have been repaid and/or redeemed in full, the date that is 91 days prior to the stated maturity date of our 5.875% First Lien Notes due 2027, and (d) unless such notes have been repaid and/or redeemed in full, the date that is 91 days prior to the stated maturity date of our 5.000% First Lien Notes due 2028. |  |
Securitized Financing Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  |  |  |  | $ 0 |  |
Line of credit facility maximum borrowing capacity, future capacity upon satisfaction of certain conditions |  |  |  |  | 0 |  |
Term Loan Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | 1,025,000,000.000 |  |
Term Loan Facility [Member] | SOFR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  | 2.50% |  |  |  | 3.50% |
Term Loan Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  | 1.50% |  |  |  | 2.50% |
Revolving Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Prepayment exception for the funding of variable funding notes replaced with qualified securitization facility notes | $ 500,000,000 |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 210,000,000 |  |
Available borrowing capacity |  |  |  |  | 715,000,000 |  |
Aggregate amount of certain additional obligations permitted to be outstanding |  |  |  | $ 2,500,000,000 | $ 5,500,000,000 |  |
Percent of net available cash from first facilities to be applied to prepay existing term loans |  |  |  |  | 40.00% |  |
Securitization and receivables facilities received amount used in amendment clause |  |  |  |  | $ 1,915,000,000 |  |
Net available cash received from drawings, amount of commitments of variable funding notes |  |  |  |  | $ 500,000,000 |  |
Percent of net available cash from securitization and receivables facilities in excess of benchmark amount, to be applied to existing term loans |  |  |  |  | 100.00% |  |
Cap amount from amendment clause |  |  |  |  | $ 5,500,000,000 |  |
Maximum first lien leverage ratio covenant |  |  |  |  | 5.25 |  |
Future maximum first lien leverage ratio covenant |  |  |  |  | 4.75 |  |
Repayment of debt |  |  | $ 402,000,000 |  |  |  |
Revolving Facility [Member] | SOFR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin | 2.50% |  |  |  |  | 3.50% |
Revolving Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin | 1.50% |  |  |  |  | 2.50% |
Revolving Facility [Member] | Securitized Financing Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Prepayment exception for the funding of variable funding notes replaced with qualified securitization facility notes | $ 500,000,000 |  |  |  |  |  |
Secured Fiber Network Revenue Term Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 750,000,000 |  |  |  |
Weighted average interest rate |  |  | 7.40% |  |  |  |
Repayment term |  |  | 7 years |  |  |  |
Secured Fiber Network Revenue Term Notes, Class A-2 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 530,000,000 |  |  |  |
Interest rate |  |  | 6.19% |  |  |  |
Secured Fiber Network Revenue Term Notes, Class B [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 73,000,000 |  |  |  |
Interest rate |  |  | 7.02% |  |  |  |
Secured Fiber Network Revenue Term Notes, Class C [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 147,000,000 |  |  |  |
Interest rate |  |  | 11.16% |  |  |  |
Fiber Term Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  |  | 5.00% |  |
VFN Amendment [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  |  | $ 0 |  |  |  |
Line of credit facility maximum borrowing capacity, future capacity upon satisfaction of certain conditions |  |  | $ 500,000,000 |  |  |  |
DDTL Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  |  | 2.00% |  |
Aggregate principal amount |  |  |  |  |  | $ 1,500,000,000 |
Maximum first lien leverage ratio covenant |  |  |  |  |  | 6.75 |
Future maximum first lien leverage ratio covenant |  |  |  |  |  | 2.00 |
DDTL Facility [Member] | Federal Funds Effective Rate [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  | 0.50% |
DDTL Facility [Member] | One Month SOFR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  | 1.00% |
DDTL Facility [Member] | Fixed Rate Component [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  | 0.75% |
DDTL Facility [Member] | SOFR Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  | 1.75% |
Terminating Lender, Revolving Credit Commitments [Member] | Frontier Holdings [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  |  |  |  |  |  | 50,000,000
New Lender, Revolving Credit Commitments [Member] | Frontier Holdings [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  |  |  |  |  |  | $ 75,000,000
Maximum [Member] | Revolving Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Additional prepayment exception with respect to the Term Facility | $ 135,000,000 |  |  |  |  |  |
Maximum [Member] | DDTL Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 750,000,000 |
Long-term Line of Credit |  |  |  |  |  | $ 200,000,000 |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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