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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Maturities Of Our Debt and Finance Leases (Details) $ in Millions | Mar. 31, 2021 USD ($)
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Debt Disclosure [Abstract] |
2021 | $ 351
2022 | 419
2023 | 629
2024 | 955
2025 | 305
Thereafter | $ 2,400

X
- Definition Scheduled maturities, Remainder of Fiscal Year, short-term borrowings, long-term debt, and finance lease obligations + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Scheduled maturities, Year 2, short-term borrowings, long-term debt, and finance lease obligations + References No definition available. + Details
Name: | jblu_ScheduledmaturitiesYear2shorttermborrowingslongtermdebtandfinanceleaseobligations
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Scheduled maturities, Year 3, short-term borrowings, long-term debt, and finance lease obligations + References No definition available. + Details
Name: | jblu_ScheduledmaturitiesYear3shorttermborrowingslongtermdebtandfinanceleaseobligations
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Scheduled maturities, Year 4, short-term borrowings, long-term debt, and finance lease obligations + References No definition available. + Details
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Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Scheduled maturities, Year 5, short-term borrowings, long-term debt, and finance lease obligations + References No definition available. + Details
Name: | jblu_ScheduledmaturitiesYear5shorttermborrowingslongtermdebtandfinanceleaseobligations
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Scheduled maturities, after Year 5, short-term borrowings, long-term debt, and finance lease obligations + References No definition available. + Details
Name: | jblu_ScheduledmaturitiesafterYear5shorttermborrowingslongtermdebtandfinanceleaseobligations
Namespace Prefix: | jblu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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