XML 57 R73.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Fair Value (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Disclosures [Abstract] |  |  |
Cash Equivalent Maturity Period Description | 90 days or less |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | $ 0 | $ 0 | $ 0

X
- Definition Cash Equivalent maturity period description. + References No definition available. + Details
Name: | jblu_CashEquivalentMaturityPeriodDescription
Namespace Prefix: | jblu_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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