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Employee Benefit Plans - Schedule of Expected Future Service Benefit Payments (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 715
2019 754
2020 799
2021 843
2022 884
2023-2027 4,976
Retiree Medical And Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 96
2019 92
2020 80
2021 75
2022 70
2023-2027 315
American Airlines, Inc. [Member] | Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 712
2019 750
2020 795
2021 839
2022 879
2023-2027 4,951
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 96
2019 92
2020 80
2021 75
2022 70
2023-2027 $ 314