Commitments and Contingencies - Flight Equipment Commitments (Details) $ in Millions	Mar. 31, 2025 USD ($) aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2025 \| $	$ 734
2026 \| $	721
2027 \| $	393
2028 \| $	410
2029 \| $	321
Thereafter \| $	3,727
Total \| $	$ 6,306
Remainder of 2025	18
2026	17
2027	8
2028	9
2029	7
Thereafter	44
Total	103
Airbus A220
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2025	15
2026	16
2027	8
2028	9
2029	7
Thereafter	0
Total	55
Number of available aircraft	20
Airbus A321neo
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2025	3
2026	1
2027	0
2028	0
2029	0
Thereafter	44
Total	48

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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

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

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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.

+ 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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