Basis of Presentation and Summary of Significant Accounting Policies - Regional Expenses (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Regional Expenses [Line Items]
Aircraft fuel and related taxes	$ 8,053	$ 6,128	$ 5,071
Salaries, wages and benefits	12,251	11,954	10,967
Maintenance, materials and repairs	2,050	1,959	1,834
Other rent and landing fees	1,900	1,806	1,772
Aircraft rent	1,264	1,197	1,203
Selling expenses	1,520	1,477	1,323
Depreciation and amortization	1,839	1,702	1,525
Other	5,088	4,910	4,634
Total regional expenses	$ 7,133	6,546	6,044
Republic Holdings [Member]
Regional Expenses [Line Items]
Ownership interest	25.00%
Regional Carrier [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	$ 1,843	1,382	1,109
Salaries, wages and benefits	1,591	1,452	1,333
Capacity purchases from third-party regional carriers	1,431	1,581	1,538
Maintenance, materials and repairs	340	281	345
Other rent and landing fees	610	625	564
Aircraft rent	32	35	36
Selling expenses	369	361	347
Depreciation and amortization	318	315	301
Special items, net	6	22	14
Other	593	492	457
Total regional expenses	7,133	6,546	6,044
Regional Carrier [Member] \| Republic [Member]
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	565
American Airlines, Inc. [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	8,053	6,128	5,071
Salaries, wages and benefits	12,240	11,942	10,958
Maintenance, materials and repairs	2,050	1,959	1,834
Other rent and landing fees	1,900	1,806	1,772
Aircraft rent	1,264	1,197	1,203
Selling expenses	1,520	1,477	1,323
Depreciation and amortization	1,839	1,702	1,525
Other	5,090	4,910	4,641
Total regional expenses	$ 7,064	6,572	6,009
American Airlines, Inc. [Member] \| Republic Holdings [Member]
Regional Expenses [Line Items]
Ownership interest	25.00%
American Airlines, Inc. [Member] \| Regional Carrier [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	$ 1,843	1,382	1,109
Salaries, wages and benefits	338	356	327
Capacity purchases from third-party regional carriers	3,267	3,283	3,186
Maintenance, materials and repairs	8	7	4
Other rent and landing fees	583	602	487
Aircraft rent	27	27	28
Selling expenses	369	361	347
Depreciation and amortization	267	262	237
Special items, net	0	3	13
Other	362	289	271
Total regional expenses	7,064	$ 6,572	$ 6,009
American Airlines, Inc. [Member] \| Regional Carrier [Member] \| Republic [Member]
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	$ 565

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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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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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