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Operating Leases - Aircraft Rent Expense and Maintenance Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Leases [Abstract] |  |  |  |  |
Aircraft rent expense (benefit) | $ (147) | $ (148) | $ (306) | $ (279) |
Supplemental rent expense for maintenance-related reserves deemed non-recoverable | (7) | (2) | (7) | (2) |
Supplemental rent expense related to probable lease return condition obligations | 1 | $ 22 | 14 | $ 24 |
Leased aircraft return cost liability | 31 |  | 31 |  | $ 26
Disbursement previously paid | $ 104 |  | $ 104 |  |

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- Definition Aircraft Lease Returns, Liability + References No definition available. + Details
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Namespace Prefix: | fron_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Gain (Loss) On Renewal Of Lease + References No definition available. + Details
Name: | fron_GainLossOnRenewalOfLease
Namespace Prefix: | fron_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Lessee, Maintenance Deposit Refund + References No definition available. + Details
Name: | fron_LesseeMaintenanceDepositRefund
Namespace Prefix: | fron_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Supplemental Rent Expense (Benefit), Non-Recoverable + References No definition available. + Details
Name: | fron_SupplementalRentExpenseBenefitNonRecoverable
Namespace Prefix: | fron_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Supplemental Rent Expense, Lease Return Obligations + References No definition available. + Details
Name: | fron_SupplementalRentExpenseLeaseReturnObligations
Namespace Prefix: | fron_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration