Regional Expenses (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Regional Expenses [Line Items]
Aircraft fuel and related taxes	$ 1,995	$ 2,103	$ 3,722	$ 3,866
Salaries, wages and benefits	3,200	3,095	6,290	6,111
Maintenance, materials and repairs	575	505	1,136	973
Other rent and landing fees	535	495	1,039	962
Aircraft rent	334	311	661	621
Selling expenses	401	385	771	742
Depreciation and amortization	489	457	969	898
Other	1,271	1,313	2,521	2,574
Total regional expenses	1,886	1,793	3,648	3,490
American Airlines, Inc. [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	1,995	2,103	3,722	3,866
Salaries, wages and benefits	3,198	3,091	6,286	6,105
Maintenance, materials and repairs	575	505	1,136	973
Other rent and landing fees	535	495	1,039	962
Aircraft rent	334	311	661	621
Selling expenses	401	385	771	742
Depreciation and amortization	489	457	969	898
Other	1,272	1,313	2,522	2,574
Total regional expenses	1,911	1,784	3,702	3,465
Regional Carrier [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	487	465	909	863
Salaries, wages and benefits	439	389	848	772
Capacity purchases from third-party regional carriers	352	364	692	717
Maintenance, materials and repairs	101	89	195	168
Other rent and landing fees	162	153	329	300
Aircraft rent	8	8	15	17
Selling expenses	106	96	197	181
Depreciation and amortization	83	82	162	165
Other	148	147	301	307
Total regional expenses	1,886	1,793	3,648	3,490
Regional Carrier [Member] \| American Airlines, Inc. [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	487	465	909	863
Salaries, wages and benefits	85	87	165	169
Capacity purchases from third-party regional carriers	907	825	1,765	1,622
Maintenance, materials and repairs	5	3	9	5
Other rent and landing fees	154	147	313	288
Aircraft rent	8	7	15	14
Selling expenses	105	96	197	181
Depreciation and amortization	71	67	138	135
Other	89	87	191	188
Total regional expenses	1,911	1,784	3,702	3,465
Regional Carrier [Member] \| Republic Airline Inc. [Member]
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	149	144	292	282
Regional Carrier [Member] \| Republic Airline Inc. [Member] \| American Airlines, Inc. [Member]
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	$ 149	$ 144	$ 292	$ 282
Republic Airways Holdings, Inc. [Member]
Regional Expenses [Line Items]
Ownership percentage	25.00%		25.00%
Republic Airways Holdings, Inc. [Member] \| American Airlines, Inc. [Member]
Regional Expenses [Line Items]
Ownership percentage	25.00%		25.00%

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Regional Expenses [Line Items]

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Maintenance costs incurred and directly related to services rendered by an entity during the reporting period. Includes the cost of inspections and repairs, materials and routine maintenance costs for all aircraft and engines.

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

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

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

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Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period.

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Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.

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Direct costs incurred at airports in which the entity conducts flight operations. The costs primarily consist of fees paid to the airport authority for takeoff and landing, gate space and facilities, allocations of common space such as security and other terminal costs and fuel storage facilities.

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