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Special Items (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Special Items
Union contract costs	$ 95	$ 0
Spirit acquisition costs	17	0
Special items	$ 112	$ 0

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- Definition

Special items during period

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No definition available.

+ Details

Name:	jblu_SpecialItems
Namespace Prefix:	jblu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Special Items

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No definition available.

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Name:	jblu_SpecialItemsAbstract
Namespace Prefix:	jblu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Special Items, Union Contract Costs

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No definition available.

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Name:	jblu_SpecialItemsUnionContractCosts
Namespace Prefix:	jblu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Spirit Airlines, Inc. Acquisition Related Expenses

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No definition available.

+ Details

Name:	jblu_SpiritAirlinesIncAcquisitionRelatedExpenses
Namespace Prefix:	jblu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration