CARES Act Loan, Remaining Outstanding, Amount

No definition available.

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

- Definition

CARES Act, Payroll Support Program, Grant

+ References

No definition available.

+ Details

Name:	jblu_CARESActPayrollSupportProgramGrant
Namespace Prefix:	jblu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

CARES Act, Payroll Support Program, Grant, Carrying Value, Total

+ References

No definition available.

+ Details

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

- Definition

CARES Act, Payroll Support Program, Total Payment

+ References

No definition available.

+ Details

Name:	jblu_CARESActPayrollSupportProgramTotalPayment
Namespace Prefix:	jblu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

CARES Act, Secured Loans, Eligibility Amount

+ References

No definition available.

+ Details

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

- Definition

Debt Instrument, Amortization Payments, Percentage

+ References

No definition available.

+ Details

Name:	jblu_DebtInstrumentAmortizationPaymentsPercentage
Namespace Prefix:	jblu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument Covenant Collateral Coverage Ratio Minimum

+ References

No definition available.

+ Details

Name:	jblu_DebtInstrumentCovenantCollateralCoverageRatioMinimum
Namespace Prefix:	jblu_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of Aircraft, Secured Debt Transactions

+ References

No definition available.

+ Details

Name:	jblu_NumberofAircraftSecuredDebtTransactions
Namespace Prefix:	jblu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The carrying amount, as of the date of the latest financial statement presented, of flight equipment which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

+ References

No definition available.

+ Details

Name:	jblu_PledgedAssetsNotSeparatelyReportedFlightEquipment
Namespace Prefix:	jblu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Proceeds from Sale Leaseback Transactions

+ References

No definition available.

+ Details

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

- Definition

Sale Leaseback, Cash Proceeds, Financing

+ References

No definition available.

+ Details

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

- Definition

Sale Leaseback, Cash Proceeds, Investing

+ References

No definition available.

+ Details

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

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031898-161870

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21521-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(5))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdTradingDays
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the fees associated with providing collateral for the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCollateralFeesAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LinesOfCreditCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_LongTermDebtTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow for debt, mandatory redeemable security, and principal payment for finance lease obligation.

+ References

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of gain (loss) on sale and leaseback transaction from transfer of asset accounted for as sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123417830&loc=SL77919786-209982

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980

+ Details

Name:	us-gaap_SaleAndLeasebackTransactionGainLossNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

No definition available.

+ Details

Name:	us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AdditionalPaidInCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=jblu_PayrollSupport2PaymentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jblu_ConvertibleSeniorNotesDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jblu_NonPublicDebtFloatingRateTermLoanCreditFacilityDueThrough2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jblu_Fixedrateenhancedequipmentnotes20201AandBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=jblu_AirbusA321Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jblu_Fixedrateenhancedequipmentnotesduethrough203220201AMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jblu_Fixedrateenhancedequipmentnotesduethrough202820201BMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jblu_Fixedrateenhancedequipmentnotesduethrough202720191BMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=jblu_USDepartmentofTreasuryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=jblu_PayrollSupport3PaymentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jblu_NonPublicDebtSecuredCARESActLoanduethrough2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=jblu_BarclaysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=jblu_USDepartmentofTreasuryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=jblu_CitibankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jblu_NonPublicDebtCitibankLineofCreditduethrough2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=jblu_MorganStanleyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Narrative (Details) $ / shares in Units, shares in Millions							1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 17, 2021 USD ($)	May 06, 2021 USD ($) $ / shares shares	Apr. 29, 2021 USD ($) $ / shares	Jan. 15, 2021 $ / shares shares	Sep. 29, 2020 USD ($) $ / shares shares	Apr. 23, 2020 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) trading_day	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Nov. 03, 2020 USD ($)	Aug. 31, 2020 USD ($) airbus	Jun. 17, 2020 USD ($)
Line of Credit Facility [Line Items]
Repayment of long-term debt and finance lease obligations									$ 1,481,000,000	$ 177,000,000
Pledged assets not separately reported flight equipment								$ 6,600,000,000	6,600,000,000
CARES act, payroll support program, total payment			$ 76,000,000			$ 963,000,000		541,000,000	1,100,000,000
CARES act, payroll support program, grant			$ 53,000,000			$ 704,000,000		409,000,000	845,000,000
Line of credit facility, borrowing capacity								1,800,000,000	1,800,000,000
Class of warrant or right, outstanding (in shares) \| shares		0.7		1.0	1.2	2.7
Class of warrant or right, exercise price of warrants or rights (in dollars per share) \| $ / shares		$ 19.90	$ 14.43	$ 14.43	$ 9.50	$ 9.50
Warrants and rights outstanding, term		5 years		5 years
Warrants and rights outstanding		$ 5,000,000	$ 200,000
CARES act, payroll support program, grant, carrying value, total		$ 404,000,000						186,000,000	186,000,000
CARES act, secured loans, eligibility amount												$ 1,900,000,000
CARES act loan remaining outstanding amount								115,000,000	115,000,000
Proceeds from sale leaseback transactions											$ 563,000,000
Proceeds from sale-leaseback transactions									0	$ 118,000,000	354,000,000
Proceeds from sale-leaseback transactions											209,000,000
Sale and leaseback transaction, gain (loss), net											$ 106,000,000
Additional Paid-In Capital
Line of Credit Facility [Line Items]
Warrants and rights outstanding								9,000,000	9,000,000
CARES act, payroll support program, grant, carrying value, total								427,000,000	427,000,000
Payroll Support 2 Payments
Line of Credit Facility [Line Items]
CARES act, payroll support program, total payment									580,000,000
CARES act, payroll support program, grant									436,000,000
Long-term Debt
Line of Credit Facility [Line Items]
Repayment of long-term debt and finance lease obligations									1,500,000,000
Unsecured Debt
Line of Credit Facility [Line Items]
Warrants and rights outstanding								19,000,000	19,000,000
CARES act, payroll support program, grant, carrying value, total								$ 685,000,000	$ 685,000,000
Convertible Senior Notes Due 2026 \| Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, face amount							$ 750,000,000
Debt instrument, interest rate, stated percentage							0.50%	0.50%	0.50%
Proceeds from offering							$ 734,000,000
Debt Instrument, Convertible, Conversion Ratio							0.0385802
Debt instrument, convertible, conversion price (in dollars per share) \| $ / shares								$ 25.92	$ 25.92
Convertible Senior Notes Due 2026 \| Senior Notes \| Debt Instrument, Redemption, Period One
Line of Credit Facility [Line Items]
Debt instrument, redemption price, percentage							100.00%
Trading days \| trading_day							20
Convertible Senior Notes Due 2026 \| Senior Notes \| Debt Instrument, Redemption, Period Two
Line of Credit Facility [Line Items]
Debt instrument, redemption price, percentage							130.00%
Trading days \| trading_day							30
Floating rate term loan credit facility, due through 2024 \| Long-term Debt
Line of Credit Facility [Line Items]
Full amount repaid under the Term Loan Agreement	$ 722,000,000
Fixed rate enhanced equipment notes, 2020-1A and B \| Long-term Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount													$ 808,000,000
Fixed rate enhanced equipment notes, 2020-1A and B \| Long-term Debt \| Airbus A321
Line of Credit Facility [Line Items]
Secured debt \| airbus													24
2020-1 Series A, due through 2032 \| Long-term Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount													$ 636,000,000
Debt instrument, interest rate, stated percentage													4.00%
2020-1 Series B, due through 2028 \| Long-term Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount													$ 172,000,000
Debt instrument, interest rate, stated percentage													7.75%
2019-1 Series B, due through 2027 \| Long-term Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount													$ 115,000,000
Debt instrument, interest rate, stated percentage													8.00%
2019-1 Series B, due through 2027 \| Long-term Debt \| Airbus A321
Line of Credit Facility [Line Items]
Secured debt \| airbus													25
US Department of Treasury \| Unsecured Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount			$ 23,000,000			$ 259,000,000		$ 276,000,000	$ 276,000,000
Debt instrument, interest rate, stated percentage		1.00%		1.00%		1.00%
Long-term debt, term						10 years
US Department of Treasury \| Unsecured Debt \| Payroll Support 2 Payments
Line of Credit Facility [Line Items]
Debt instrument, face amount								144,000,000	144,000,000
US Department of Treasury \| Unsecured Debt \| Payroll Support 3 Payments
Line of Credit Facility [Line Items]
Debt instrument, face amount								132,000,000	132,000,000
US Department of Treasury \| Unsecured Debt \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Debt instrument, term		10 years		10 years
Debt instrument, basis spread on variable rate		2.00%		2.00%		2.00%
US Department of Treasury \| Secured CARES Act Loan, due through 2025 \| Long-term Debt
Line of Credit Facility [Line Items]
Line of credit facility, collateral fees, amount									550,000,000
Barclays \| Floating rate term loan credit facility, due through 2024 \| Long-term Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount														$ 750,000,000
Amortization payments, percentage											5.00%
Barclays \| Floating rate term loan credit facility, due through 2024 \| London Interbank Offered Rate (LIBOR) \| Long-term Debt
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.00%
US Department of Treasury \| Secured CARES Act Loan, due through 2025 \| Long-term Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount					$ 115,000,000
Debt instrument covenant collateral coverage ratio minimum					1.6
US Department of Treasury \| Secured CARES Act Loan, due through 2025 \| Long-term Debt \| Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate					1.00%
US Department of Treasury \| Secured CARES Act Loan, due through 2025 \| Long-term Debt \| Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate					0.00%
US Department of Treasury \| Secured CARES Act Loan, due through 2025 \| London Interbank Offered Rate (LIBOR) \| Long-term Debt
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate					2.75%
Citibank \| Citibank line of credit, due through 2023 \| Line of Credit
Line of Credit Facility [Line Items]
Line of credit, current								550,000,000	550,000,000
Morgan Stanley \| Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity								$ 200,000,000	$ 200,000,000