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Basis of Presentation and Summary of Significant Accounting Policies - Regional Expenses (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Regional Expenses [Line Items]      
Depreciation and amortization $ 2,019 $ 2,040 $ 1,982
Aircraft rent $ 1,425 1,341 1,326
Republic Holdings      
Regional Expenses [Line Items]      
Ownership interest 25.00%    
Regional Carrier      
Regional Expenses [Line Items]      
Depreciation and amortization $ 316 325 336
Aircraft rent 6 13 29
Regional Carrier | Republic      
Regional Expenses [Line Items]      
Capacity purchases from third-party regional carriers 495 438 590
American Airlines, Inc.      
Regional Expenses [Line Items]      
Depreciation and amortization 2,019 2,040 1,982
Aircraft rent $ 1,425 1,341 1,326
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 $ 263 273 286
Aircraft rent 6 13 29
American Airlines, Inc. | Regional Carrier | Republic      
Regional Expenses [Line Items]      
Capacity purchases from third-party regional carriers $ 495 $ 438 $ 590