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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Aircraft Failed Sale-Leaseback Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Disclosure [Abstract] |  |  |
Proceeds from failed sale-leaseback transactions | $ 668 | $ 1,331 | $ 0

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- Definition Sale Leaseback, Cash Proceeds, Financing + References No definition available. + Details
Name: | jblu_SaleLeasebackCashProceedsFinancing
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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