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Debt - Special Facility Revenue Bonds (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 31, 2020
Debt Instrument [Line Items]            
Proceeds from issuance of long-term debt     $ 12,190 $ 11,780 $ 3,960  
Payments of debt issuance costs     209 93 61  
2020 JFK Bonds and 2021 JFK Bonds | Secured Debt | Restricted Cash and Short-term Investment            
Debt Instrument [Line Items]            
Proceeds from issuance of long-term debt     236      
2021 JFK Bonds | Secured Debt            
Debt Instrument [Line Items]            
Aggregate principal issued $ 150          
Proceeds from issuance of long-term debt 150          
Payments of debt issuance costs 4          
2021 JFK Bonds, 2.25% Matures 2026 | Secured Debt            
Debt Instrument [Line Items]            
Aggregate principal issued $ 70          
Fixed interest rate per annum 2.25%          
2021 JFK Bonds, 3.00% Matures 2031 | Secured Debt            
Debt Instrument [Line Items]            
Aggregate principal issued $ 80          
Fixed interest rate per annum 3.00%          
2016 JFK Bonds And 2020 JFK Bonds | Secured Debt            
Debt Instrument [Line Items]            
Repayments of long-term debt $ 62          
JFK Airport Upgrade            
Debt Instrument [Line Items]            
Construction project, expected Cost           $ 439
JFK Airport Upgrade | 2020 JFK Bonds            
Debt Instrument [Line Items]            
Construction project, expected cost, funded by special facility revenue bond   $ 298        
JFK Airport Upgrade | 2021 JFK Bonds            
Debt Instrument [Line Items]            
Construction project, expected cost, funded by special facility revenue bond $ 84          
American Airlines, Inc.            
Debt Instrument [Line Items]            
Proceeds from issuance of long-term debt     10,209 8,959 3,210  
Payments of debt issuance costs     $ 207 $ 85 $ 52  
American Airlines, Inc. | JFK Airport Upgrade            
Debt Instrument [Line Items]            
Construction project, expected Cost           $ 439