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Special Items (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Special items |  |
Spirit acquisition costs | $ 532 | $ 17
Voluntary opt-out costs | 15 | 0
Embraer E190 fleet transition costs | 15 | 0
Union contract costs | 0 | 95
Total special items | $ 562 | $ 112

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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, Union Contract Costs + References No definition available. + Details
Name: | jblu_SpecialItemsUnionContractCosts
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