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Employee Benefit Plans - Defined Contribution and Multiemployer Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 14, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 29, 2019
Defined Contribution Plan Disclosure [Line Items]          
Contributions to defined contribution benefit plans   $ 860 $ 860 $ 846  
American Airlines, Inc.          
Defined Contribution Plan Disclosure [Line Items]          
Contributions to defined contribution benefit plans   835 836 825  
Pension Plan | International Association of Machinists & Aerospace Workers (IAM) National Pension Fund          
Defined Contribution Plan Disclosure [Line Items]          
Contribution to multiemployer plan by employer, individually significant   40 32 31  
Contributions to multiemployer plan by company     $ 510    
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%        
Pension Plan | International Association of Machinists & Aerospace Workers (IAM) National Pension Fund | American Airlines, Inc.          
Defined Contribution Plan Disclosure [Line Items]          
Contribution to multiemployer plan by employer, individually significant   $ 40 $ 32 $ 31  
Contributions to multiemployer plan by company     $ 510    
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%