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Employee Benefit Plans - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 14, 2019
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 29, 2019
Defined Benefit Plan Disclosure [Line Items]          
Weighted average expected rate of return on plan assets   8.00%      
Defined benefit plan, assumptions used for expected long-term rate of return on plan assets, term   10 years      
Estimated period of liquidation of underlying assets   10 years      
Defined benefit plan master trust future funding commitments   $ 1,300      
Defined benefit plan master trust future funding commitments, period   5 years      
Contributions to defined contribution benefit plans   $ 1,100 $ 949 $ 920  
Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Weighted average expected rate of return on plan assets   8.00% 8.00% 8.00%  
Minimum required employer contributions, next fiscal year   $ 284      
International Association of Machinists & Aerospace Workers (IAM) National Pension Fund | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Contribution to multiemployer plan by employer, individually significant   $ 52 $ 46 $ 43  
Contributions to multiemployer plan by company     $ 533    
Contributions to multiemployer plan by company, percentage of total contributions to plan (more than)     5.00%    
Multiemployer plan, funded status percentage (over)         80.00%
Rehabilitation plan, percentage increase in company annual contributions 2.50%        
American Airlines, Inc.          
Defined Benefit Plan Disclosure [Line Items]          
Weighted average expected rate of return on plan assets   8.00%      
Defined benefit plan, assumptions used for expected long-term rate of return on plan assets, term   10 years      
Estimated period of liquidation of underlying assets   10 years      
Defined benefit plan master trust future funding commitments   $ 1,300      
Defined benefit plan master trust future funding commitments, period   5 years      
Contributions to defined contribution benefit plans   $ 1,100 $ 916 $ 893  
American Airlines, Inc. | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Weighted average expected rate of return on plan assets   8.00% 8.00% 8.00%  
Minimum required employer contributions, next fiscal year   $ 280      
American Airlines, Inc. | International Association of Machinists & Aerospace Workers (IAM) National Pension Fund | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Contribution to multiemployer plan by employer, individually significant   $ 52 $ 46 $ 43  
Contributions to multiemployer plan by company     $ 533    
Contributions to multiemployer plan by company, percentage of total contributions to plan (more than)     5.00%    
Multiemployer plan, funded status percentage (over)         80.00%
Rehabilitation plan, percentage increase in company annual contributions 2.50%