Commitments and Contingencies - Narrative (Details) $ in Millions		3 Months Ended
Jun. 30, 2021 USD ($) aircraft	Jun. 30, 2021 USD ($) aircraft
Future Purchase Commitments
Commitments under leases that had not yet commenced \| $	$ 719	$ 719
Future aircraft purchase commitments
Future Purchase Commitments
Future aircraft purchase commitments \| $	$ 15,160	$ 15,160
Aircraft purchase commitment	259	259
Minimum
Future Purchase Commitments
Leases not yet commenced, term	7 years
Maximum
Future Purchase Commitments
Leases not yet commenced, term	12 years
A321neo \| Future aircraft purchase commitments
Future Purchase Commitments
Number of aircraft with options converted to firm order		25
A350-900 \| Future aircraft purchase commitments
Future Purchase Commitments
Number of aircraft for which delivery date has been accelerated		2
Aircraft purchase commitment	27	27
Number of lease commitments included in purchase commitment	7	7
A330-900neo \| Future aircraft purchase commitments
Future Purchase Commitments
Number of aircraft for which delivery date has been accelerated		1
Aircraft purchase commitment	26	26
B737-900ER \| Future aircraft purchase commitments
Future Purchase Commitments
Aircraft purchase commitment	29	29

Amount of lessee's finance leases and operating leases not yet commenced.

No definition available.

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- Definition

Term of lessee's finance leases and operating leases not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Number Of Aircraft, Delivery Date Accelerated

+ References

No definition available.

+ Details

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- Definition

Number Of Aircraft, Options Converted To Firm Order

+ References

No definition available.

+ Details

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- Definition

Number Of Lease Commitments Included In Purchase Commitments

+ References

No definition available.

+ Details

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- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308

+ Details

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- 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

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- Definition

The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes.

+ References

No definition available.

+ Details

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