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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
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Proceeds from failed sale-leaseback transactions	$ 668	$ 1,331	$ 0

X

- 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