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Revenue Recognition - Current And Non-Current Air Traffic Liability (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Revenue From Contract With Customer [Roll Forward] |  |
Beginning balance | $ 1,125 | $ 1,072
TrueBlue® points redeemed passenger | (357) | (347)
TrueBlue® points redeemed other | (18) | (14)
TrueBlue® points earned and sold | 381 | 361
Ending balance | $ 1,131 | $ 1,072

X
- Definition Value of revenue deferred or cost to provide future products or services, primarily air transportation, associated with programs used by airlines to encourage passenger loyalty by providing rewards geared to the frequency of travel on the sponsoring airline, typically in the form of frequent flyer miles, points, or segments that can be accumulated and converted into free or discounted travel or other redemption options. + References No definition available. + Details
Name: | jblu_AirTrafficLiability
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Increase (Decrease) to Air Traffic Liability - Points Other + References No definition available. + Details
Name: | jblu_IncreaseDecreaseToAirTrafficLiabilityPointsOther
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (decrease) to Air Traffic Liability due to points earned + References No definition available. + Details
Name: | jblu_IncreaseDecreasetoAirTrafficLiabilityPointsEarned
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase (decrease) to Air Traffic Liability due to points redeemed + References No definition available. + Details
Name: | jblu_IncreaseDecreasetoAirTrafficLiabilityPointsRedeemed
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revenue From Contract With Customer + References No definition available. + Details
Name: | jblu_RevenueFromContractWithCustomerRollForward
Namespace Prefix: | jblu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration