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Debt - Special Facility Revenue Bonds (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 31, 2020
Debt Instrument [Line Items]          
Proceeds from issuance of long-term debt   $ 11,780 $ 3,960 $ 2,354  
Payments of debt issuance costs   93 61 59  
American Airlines, Inc.          
Debt Instrument [Line Items]          
Proceeds from issuance of long-term debt   8,959 3,210 2,354  
Payments of debt issuance costs   $ 85 $ 52 $ 59  
American Airlines, Inc. | Special Facility Revenue Bonds | Senior Notes          
Debt Instrument [Line Items]          
Aggregate principal issued $ 360        
American Airlines, Inc. | Special Facility Revenue Bonds | Secured Debt          
Debt Instrument [Line Items]          
Long term debt, price, percentage of par value 98.00%        
Proceeds from issuance of long-term debt $ 353        
Payments of debt issuance costs 8        
Repayments of long-term debt 47        
Reimbursement of project costs 17        
American Airlines, Inc. | Senior Note 5.25% Matures 2031 | Secured Debt          
Debt Instrument [Line Items]          
Aggregate principal issued $ 214        
Fixed interest rate per annum 5.25%        
American Airlines, Inc. | Senior Note 5.375% Matures 2036 | Secured Debt          
Debt Instrument [Line Items]          
Aggregate principal issued $ 146        
Fixed interest rate per annum 5.375%        
American Airlines, Inc. | JFK Airport Upgrade          
Debt Instrument [Line Items]          
Construction project, investment amount         $ 344