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Commitments and Contingencies (Details) $ in Millions	Mar. 31, 2020 USD ($) aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	$ 900
Unrecorded Unconditional Purchase Obligation, Due within Two Years	1,400
Unrecorded Unconditional Purchase Obligation, Due within Three Years	1,300
Unrecorded Unconditional Purchase Obligation, Due within Four Years	1,700
Unrecorded Unconditional Purchase Obligation, Due within Five Years	1,600
Unrecorded Unconditional Purchase Obligation, Due after Five Years	500
Restricted assets pledged under letter of credit	26
Restricted Assets Pledged Related To Workers Compensation Insurance Policies And Other Business Partner Agreements	$ 34
A-321 Neo [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligations Disclosure | aircraft	76
Number of Aircraft Expected to be Delivered within Fiscal Year | aircraft	4
A220-300 [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligations Disclosure | aircraft	70
Number of Aircraft Expected to be Delivered within Fiscal Year | aircraft	1

X

- Definition

Number of Aircraft Expected to be Delivered within Fiscal Year

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- Definition

Restricted assets pledged under standby letters of credit related to workers compensation insurance policies and other agreements requiring issuance of letters of credit.

+ References

No definition available.

+ Details

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- Definition

Restricted assets pledged under standby letters of credit related to lease agreements.

+ References

No definition available.

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- Definition

Unrecorded Unconditional Purchase Obligations Disclosure.

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- Definition

Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

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- Definition

Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

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- Definition

Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

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- Definition

Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

+ Details

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- Definition

Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

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- Definition

Minimum amount of purchase arrangement maturing in the remainder of the fiscal year following the latest fiscal year ended. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

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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.

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