Regional Expenses (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Regional Expenses [Line Items]
Depreciation and amortization	$ 480	$ 498	$ 1,439	$ 1,557
Aircraft rent	358	336	1,064	1,004
American Airlines, Inc.
Regional Expenses [Line Items]
Depreciation and amortization	480	498	1,439	1,557
Aircraft rent	358	336	1,064	1,004
Regional Carrier
Regional Expenses [Line Items]
Depreciation and amortization	78	79	236	247
Aircraft rent	1	3	5	11
Regional Carrier \| American Airlines, Inc.
Regional Expenses [Line Items]
Depreciation and amortization	65	66	197	207
Aircraft rent	1	3	5	11
Regional Carrier \| Republic Airline Inc.
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	125	102	343	313
Regional Carrier \| Republic Airline Inc. \| American Airlines, Inc.
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	$ 125	$ 102	$ 343	$ 313
Republic Airways Holdings, Inc. \| American Airlines, Inc.
Regional Expenses [Line Items]
Ownership percentage	25.00%		25.00%

Capacity Purchases

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- Definition

Regional Expenses [Line Items]

+ References

No definition available.

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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

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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