Basis of Presentation and Summary of Significant Accounting Policies - Regional Expenses (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Regional Expenses [Line Items]
Depreciation and amortization	$ 1,936	$ 1,977	$ 2,019
Aircraft rent	1,369	1,395	1,425
Capacity purchases from third-party regional carriers	$ 4,643	4,385	3,204
Republic Holdings
Regional Expenses [Line Items]
Ownership Interest	25.00%
Regional Carrier
Regional Expenses [Line Items]
Depreciation and amortization	$ 318	321	316
Aircraft rent	7	5	6
Regional Carrier \| Republic Holdings
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	636	592	495
American Airlines, Inc.
Regional Expenses [Line Items]
Depreciation and amortization	1,927	1,969	2,019
Aircraft rent	1,369	1,395	1,425
Capacity purchases from third-party regional carriers	$ 4,619	4,345	3,111
American Airlines, Inc. \| Republic Holdings
Regional Expenses [Line Items]
Ownership Interest	25.00%
American Airlines, Inc. \| Regional Carrier
Regional Expenses [Line Items]
Depreciation and amortization	$ 271	269	263
Aircraft rent	7	5	6
American Airlines, Inc. \| Regional Carrier \| Republic Holdings
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	$ 636	$ 592	$ 495

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
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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 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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