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Revenue Recognition - Current And Non-Current Air Traffic Liability (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Beginning balance	$ 733	$ 661
Increase (decrease) to air traffic liability - points redeemed	(45)	(103)
Increase (decrease) to air traffic liability - points earned	70	98
Ending balance	$ 758	$ 656

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

X

- 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

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration