Commitments and Contingencies - Flight Equipment Commitments (Details) $ in Millions	Mar. 31, 2024 USD ($) aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2024 \| $	$ 820
2025 \| $	1,165
2026 \| $	1,144
2027 \| $	1,011
2028 \| $	1,529
Thereafter \| $	1,198
Total \| $	$ 6,867
Remainder of 2024	19
2025	25
2026	24
2027	14
2028	23
Thereafter	18
Total	123
Airbus A321neo
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2024	4
2025	5
2026	4
2027	9
2028	16
Thereafter	14
Total	52
Airbus A220
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2024	15
2025	20
2026	20
2027	5
2028	7
Thereafter	4
Total	71
Number of available aircraft	20

Number Of Available Aircraft

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Unrecorded Unconditional Purchase Obligations

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Unrecorded Unconditional Purchase Obligations, After Year Four

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Unrecorded Unconditional Purchase Obligations, Remainder Of Fiscal Year

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Unrecorded Unconditional Purchase Obligations, Year Four

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Unrecorded Unconditional Purchase Obligations, Year One

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Unrecorded Unconditional Purchase Obligations, Year Three

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in remainder of current fiscal year.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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