Commitments and Contingencies - Flight Equipment Commitments (Details) $ in Millions	Sep. 30, 2024 USD ($) aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2024 \| $	$ 283
2025 \| $	986
2026 \| $	723
2027 \| $	192
2028 \| $	262
Thereafter \| $	3,959
Total \| $	$ 6,405
Remainder of 2024	7
2025	24
2026	20
2027	5
2028	7
Thereafter	48
Total	111
Airbus A220
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2024	6
2025	20
2026	20
2027	5
2028	7
Thereafter	4
Total	62
Number of available aircraft	20
Airbus A321neo
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2024	1
2025	4
2026	0
2027	0
2028	0
Thereafter	44
Total	49

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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

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

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Amount of unrecorded obligation to transfer funds in future for fixed or minimum amount or quantity of product and service at fixed or minimum price. Includes, but is not limited to, lease not yet commenced and take-or-pay and throughput contracts.

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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 (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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