Revenue Recognition - Current And Non-Current Air Traffic Liability (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025
Revenue From Contract With Customer [Roll Forward]
Beginning balance	$ 1,227	$ 1,125
TrueBlue® points redeemed passenger	(564)	(498)
TrueBlue® points redeemed other	(41)	(29)
TrueBlue® points earned and sold	720	582
Ending balance	$ 1,342	$ 1,180

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.

No definition available.

Name:	jblu_AirTrafficLiability
Namespace Prefix:	jblu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant