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Special Items (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Special items |  |  |  |  |
Union contract costs | $ 26 | $ 26 | $ 8 | $ 26 | $ 104
Voluntary opt-out costs |  | 1 | 0 | 17 | 0
Spirit-related costs |  | 0 | 25 | 532 | 64
Embraer E190 fleet transition costs |  | 0 | 0 | 15 | 0
Total special items |  | $ 27 | $ 33 | $ 590 | $ 168

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

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- Definition Operating Special Items + References No definition available. + Details
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Balance Type: | na
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- Definition Special items relating to the EMBRAER E190 fleet transition. + References No definition available. + Details
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- Definition Special Items, Union Contract Costs + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Special Items, Voluntary Opt-out Costs + References No definition available. + Details
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- Definition Spirit Airlines, Inc. Acquisition Related Expenses + References No definition available. + Details
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Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration