Regional Expenses (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Regional Expenses [Line Items]
Aircraft fuel and related taxes	$ 1,989	$ 2,234	$ 5,710	$ 6,100
Salaries, wages and benefits	3,219	3,131	9,509	9,243
Maintenance, materials and repairs	610	526	1,745	1,499
Other rent and landing fees	530	502	1,568	1,463
Aircraft rent	335	318	996	939
Selling expenses	424	395	1,194	1,136
Depreciation and amortization	499	468	1,469	1,366
Other	1,336	1,260	3,859	3,834
Total regional expenses	1,933	1,833	5,582	5,323
American Airlines, Inc. [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	1,989	2,234	5,710	6,100
Salaries, wages and benefits	3,217	3,129	9,503	9,234
Maintenance, materials and repairs	610	526	1,745	1,499
Other rent and landing fees	530	502	1,568	1,463
Aircraft rent	335	318	996	939
Selling expenses	424	395	1,194	1,136
Depreciation and amortization	499	468	1,469	1,366
Other	1,337	1,261	3,860	3,835
Total regional expenses	1,913	1,810	5,616	5,275
Regional Carrier [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	485	506	1,395	1,369
Salaries, wages and benefits	461	403	1,310	1,175
Capacity purchases from third-party regional carriers	354	363	1,046	1,081
Maintenance, materials and repairs	108	83	303	251
Other rent and landing fees	167	155	495	455
Aircraft rent	8	8	23	25
Selling expenses	102	94	299	276
Depreciation and amortization	84	76	246	241
Special items, net	6	2	6	1
Other	158	143	459	449
Total regional expenses	1,933	1,833	5,582	5,323
Regional Carrier [Member] \| American Airlines, Inc. [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	485	506	1,395	1,369
Salaries, wages and benefits	76	86	241	254
Capacity purchases from third-party regional carriers	900	817	2,665	2,440
Maintenance, materials and repairs	14	1	23	6
Other rent and landing fees	159	148	472	436
Aircraft rent	8	7	23	20
Selling expenses	102	94	299	275
Depreciation and amortization	72	65	210	200
Other	97	86	288	275
Total regional expenses	1,913	1,810	5,616	5,275
Regional Carrier [Member] \| Republic Airline Inc. [Member]
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	150	142	442	423
Regional Carrier [Member] \| Republic Airline Inc. [Member] \| American Airlines, Inc. [Member]
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	$ 150	$ 142	$ 442	$ 423
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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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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Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period.

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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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