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Special Items (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Special items |  |  |  |
Voluntary opt-out costs | $ 24 | $ 1 | $ 24 | $ 16
Spirit-related costs | 0 | 0 | 0 | 532
Embraer E190 fleet transition costs | 0 | 0 | 0 | 15
Total special items | $ 24 | $ 1 | $ 24 | $ 563

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- Definition Operating special items during period + References No definition available. + Details
Name: | jblu_OperatingSpecialItems
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating Special Items + References No definition available. + Details
Name: | jblu_OperatingSpecialItemsAbstract
Namespace Prefix: | jblu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Special items relating to the EMBRAER E190 fleet transition. + References No definition available. + Details
Name: | jblu_SpecialItemsE190FleetTransition
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Special Items, Voluntary Opt-out Costs + References No definition available. + Details
Name: | jblu_SpecialItemsVoluntaryOptOutCosts
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Spirit Airlines, Inc. Acquisition Related Expenses + References No definition available. + Details
Name: | jblu_SpiritAirlinesIncAcquisitionRelatedExpenses
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration