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Employee Benefit Plans - Schedule of Expected Future Service Benefit Payments (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 753
2021 792
2022 832
2023 874
2024 914
2025-2029 5,045
Retiree Medical And Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 80
2021 71
2022 66
2023 64
2024 61
2025-2029 265
American Airlines, Inc. [Member] | Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 749
2021 788
2022 827
2023 869
2024 910
2025-2029 5,017
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 80
2021 71
2022 66
2023 64
2024 61
2025-2029 $ 265