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Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions								12 Months Ended
	Jan. 14, 2025	Jul. 01, 2024	May 22, 2024	Oct. 13, 2021	Apr. 30, 2021	Nov. 25, 2020	Oct. 08, 2020	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2019	Dec. 31, 2018	Jul. 30, 2024	Mar. 08, 2023	May 12, 2022
Debt Instrument [Line Items]
Interest rate margin								2.00%
Interest rate								6.996%	7.103%
Repayment of debt								$ 412
Financing obligation for contributions of real property to pension plan										$ 37	$ 37
Lease term of contributed property											20 years
Combined average aggregate annual rent											$ 5
Gain (loss) on contribution of property to defined benefit								0
Finance lease liability obligation								52
Frontier Holdings [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity								$ 925				$ 900
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
First Lien Notes Due 3/15/2031 [Member]
Debt Instrument [Line Items]
Aggregate principal amount													$ 750
Interest rate													8.625%
First Lien Notes Due 5/15/2030 [Member]
Debt Instrument [Line Items]
Aggregate principal amount														$ 1,200
Interest rate														8.75%
Term Loan Facility [Member]
Debt Instrument [Line Items]
Aggregate principal amount								$ 1,025
Term Loan Facility [Member] | SOFR [Member]
Debt Instrument [Line Items]
Interest rate margin								3.50%
Term Loan Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Interest rate margin								2.50%
Revolving Facility [Member]
Debt Instrument [Line Items]
Letters of credit outstanding								$ 265
Available borrowing capacity								660
Aggregate amount of certain additional obligations permitted to be outstanding			$ 2,500					$ 5,500
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
Net available cash received from drawings, amount of commitments of variable funding notes								$ 500
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
Maximum first lien leverage ratio covenant								5.25
Future maximum first lien leverage ratio covenant								4.75
Repayment of debt		$ 402
Series 2023-1 Revenue Term Notes Class A-2 Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Interest rate								6.60%
Debt instrument, maturity date								Aug. 20, 2053
Series 2023-1 Revenue Term Notes Class B Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Interest rate								8.30%
Debt instrument, maturity date								Aug. 20, 2053
Series 2023-1 Revenue Term Notes Class C Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Interest rate								11.50%
Debt instrument, maturity date								Aug. 20, 2053
Secured Fiber Network Revenue Term Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount		$ 750
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
Interest rate		6.19%
Secured Fiber Network Revenue Term Notes, Class B [Member]
Debt Instrument [Line Items]
Aggregate principal amount		$ 73
Interest rate		7.02%
Secured Fiber Network Revenue Term Notes, Class C [Member]
Debt Instrument [Line Items]
Aggregate principal amount		$ 147
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
DDTL Facility [Member]
Debt Instrument [Line Items]
Aggregate principal amount								$ 1,500
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%
Senior Secured Notes [Member] | Second Lien Notes Due 2030 [Member]
Debt Instrument [Line Items]
Aggregate principal amount				$ 1,000
Interest rate				6.00%
Maturity year				2030
Senior Secured Notes [Member] | DIP-to-Exit First Lien Notes Due 10/15/2027 [Member]
Debt Instrument [Line Items]
Aggregate principal amount							$ 1,150
Interest rate							5.875%
Debt instrument, maturity date							Oct. 15, 2027
Senior Secured Notes [Member] | DIP-to-Exit First Lien Notes Due 5/1/2028 [Member]
Debt Instrument [Line Items]
Aggregate principal amount						$ 1,550
Interest rate						5.00%
Debt instrument, maturity date						May 01, 2028
Senior Secured Notes [Member] | Second Lien Notes Due 05/01/2029 [Member]
Debt Instrument [Line Items]
Aggregate principal amount						$ 1,000
Interest rate						6.75%
Debt instrument, maturity date						May 01, 2029
Senior Secured Notes [Member] | Takeback Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount					$ 750
Interest rate					5.875%
Debt instrument, maturity date					Nov. 01, 2029
Senior Notes [Member]
Debt Instrument [Line Items]
Extinguishment of debt, amount									$ 53
Terminating Lender, Revolving Credit Commitments [Member] | Frontier Holdings [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity												50
New Lender, Revolving Credit Commitments [Member] | Frontier Holdings [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity												$ 75
Maximum [Member] | DDTL Facility [Member]
Debt Instrument [Line Items]
Aggregate principal amount								$ 750
Long-term Line of Credit								200
Line of credit facility, current borrowings								$ 200
Subsequent Event [Member] | Term Loan Facility [Member] | SOFR [Member]
Debt Instrument [Line Items]
Interest rate margin	2.50%
Subsequent Event [Member] | Term Loan Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Interest rate margin	1.50%

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