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Employee Benefit Plans - Schedule of Expected Future Service Benefit Payments (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 952
2025 977
2026 1,002
2027 1,023
2028 1,036
2029-2033 5,265
Retiree Medical and  Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 138
2025 144
2026 150
2027 150
2028 148
2029-2033 674
American Airlines, Inc. | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 947
2025 972
2026 996
2027 1,017
2028 1,030
2029-2033 5,232
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 138
2025 144
2026 150
2027 150
2028 148
2029-2033 $ 674