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Revenue Recognition - Additional Information (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
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Air traffic liability balance | $ 325 |  | $ 325 |  | $ 259
Air traffic liability recognized as passenger revenue |  |  | 89.00% |  |
Unearned travel club revenue | 47 |  | $ 47 |  | $ 60
Passenger revenue recognized | $ 10 | $ 10 | $ 18 | $ 20 |

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- Definition Contract With Customer, Liability, Air Traffic + References No definition available. + Details
Name: | fron_ContractWithCustomerLiabilityAirTraffic
Namespace Prefix: | fron_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract with Customer, Liability, Revenue Recognized, Including Opening Balance + References No definition available. + Details
Name: | fron_ContractWithCustomerLiabilityRevenueRecognizedIncludingOpeningBalance
Namespace Prefix: | fron_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract With Customer, Liability, Revenue Recognized, Percentage + References No definition available. + Details
Name: | fron_ContractWithCustomerLiabilityRevenueRecognizedPercentage
Namespace Prefix: | fron_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contract With Customer, Liability, Travel Club Revenue, Current + References No definition available. + Details
Name: | fron_ContractWithCustomerLiabilityTravelClubRevenueCurrent
Namespace Prefix: | fron_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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