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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |  |  |
Contract with customer, liability, revenue recognized |  | $ 745 | $ 878
Outstanding travel credits |  | 80 |
Loyalty points pre-purchase arrangement | $ 150 |  |
Loyalty points pre-purchase arrangement carrying value |  | $ 38 |

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- Definition Contract with Customer, Liability, Outstanding Travel Credits to be Recognized into Revenue + References No definition available. + Details
Name: | jblu_ContractWithCustomerLiabilityOutstandingTravelCreditsToBeRecognizedIntoRevenue
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Loyalty Points Pre-Purchase Arrangement + References No definition available. + Details
Name: | jblu_LoyaltyPointsPrePurchaseArrangement
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Loyalty Points Pre-Purchase Arrangement Carrying Value + References No definition available. + Details
Name: | jblu_LoyaltyPointsPrePurchaseArrangementCarryingValue
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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