Regional Expenses (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Regional Expenses [Line Items]
Depreciation and amortization	$ 474	$ 479	$ 1,418	$ 1,424
Aircraft rent	310	303	910	945
Regional expenses	1,370	1,264	4,053	3,733
American Airlines, Inc.
Regional Expenses [Line Items]
Depreciation and amortization	473	477	1,414	1,416
Aircraft rent	310	303	910	945
Regional expenses	$ 1,353	1,268	$ 4,027	3,725
Republic Airways Holdings, Inc.
Regional Expenses [Line Items]
Ownership percentage	25.00%		25.00%
Republic Airways Holdings, Inc. \| American Airlines, Inc.
Regional Expenses [Line Items]
Ownership percentage	25.00%		25.00%
Regional operating special items, net
Regional Expenses [Line Items]
Depreciation and amortization	$ 84	80	$ 244	238
Aircraft rent	2	2	7	7
Regional operating special items, net \| American Airlines, Inc.
Regional Expenses [Line Items]
Depreciation and amortization	75	70	216	208
Aircraft rent	2	2	7	7
Regional operating special items, net \| Republic Airways Holdings Inc.
Regional Expenses [Line Items]
Regional expenses	177	153	519	452
Regional operating special items, net \| Republic Airways Holdings Inc. \| American Airlines, Inc.
Regional Expenses [Line Items]
Regional expenses	$ 177	$ 153	$ 519	$ 452

Regional Expenses [Line Items]

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- Definition

Expenses incurred related to the lease of aircraft from outside third parties that are used in the entity's business operations.

+ References

No definition available.

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- Definition

Costs incurred related to air services provided by third-party transportation companies, including regional affiliates.

+ References

No definition available.

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- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

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