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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)
6 Months Ended 12 Months Ended
Apr. 20, 2020
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2021
USD ($)
reporting_unit
member
component
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Apr. 30, 2021
USD ($)
shares
Apr. 23, 2021
$ / shares
Mar. 24, 2021
USD ($)
Jan. 15, 2021
USD ($)
$ / shares
Jan. 01, 2021
USD ($)
Oct. 21, 2020
USD ($)
Sep. 25, 2020
USD ($)
Jun. 30, 2020
USD ($)
Apr. 30, 2020
USD ($)
Jan. 31, 2020
USD ($)
Nov. 30, 2019
USD ($)
Oct. 31, 2019
USD ($)
Unusual or Infrequent Item, or Both [Line Items]                                      
Decrease in flying compared to prior year period (in percentage)         24.70%                            
Decrease in domestic capacity in percentage         0.145                            
Decrease in international capacity in percentage         0.449                            
Number of team members opting for early retirement or long-term paid leave (more than) | member         1,600                            
Available liquidity         $ 15,800,000,000                            
Unrestricted cash and short-term investments         12,400,000,000                            
Line of credit facility, remaining borrowing capacity         3,411,000,000                            
Proceeds from sale of property and equipment         193,000,000 $ 351,000,000 $ 54,000,000                        
Covenant terms, minimum aggregate liquidity required         2,000,000,000                            
Adjustments to additional paid in capital, net of tax           (320,000,000)                          
Retained deficit         $ (8,638,000,000) (6,664,000,000)                          
Consolidated reporting unit | reporting_unit         1                            
Goodwill impairment         $ 0                            
Goodwill         4,091,000,000 4,091,000,000                          
Amortization expense         41,000,000 41,000,000 41,000,000                        
Impairment of intangible assets, indefinite-lived (excluding goodwill)         0                            
Indefinite lived intangible assets         1,800,000,000 1,800,000,000                          
Operating revenues         $ 29,882,000,000 17,337,000,000 45,768,000,000                        
Contract receivables settlement duration         7 days                            
Advertising expense         $ 105,000,000 57,000,000 144,000,000                        
Foreign currency gains (losses)         (4,000,000) (24,000,000) (32,000,000)                        
American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, remaining borrowing capacity         3,411,000,000                            
Proceeds from sale of property and equipment         192,000,000 351,000,000 49,000,000                        
Retained deficit         $ (7,285,000,000) (5,508,000,000)                          
Consolidated reporting unit | reporting_unit         1                            
Goodwill impairment         $ 0                            
Goodwill         4,091,000,000 4,091,000,000                          
Amortization expense         41,000,000 41,000,000 41,000,000                        
Impairment of intangible assets, indefinite-lived (excluding goodwill)         0                            
Indefinite lived intangible assets         1,800,000,000 1,800,000,000                          
Operating revenues         $ 29,880,000,000 17,335,000,000 45,761,000,000                        
Contract receivables settlement duration         7 days                            
Advertising expense         $ 105,000,000 57,000,000 144,000,000                        
Foreign currency gains (losses)         $ (4,000,000) $ (24,000,000) $ (32,000,000)                        
Minimum                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Performance obligation term         1 year                            
Minimum | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Performance obligation term         1 year                            
Maximum                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Performance obligation term         5 years                            
Maximum | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Performance obligation term         5 years                            
Air traffic liability                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Performance obligation term         1 year                            
Contract with customer, liability, updated revenue recognition period         12 months                            
Recognition of revenue         $ 1,700,000,000                            
Air traffic liability | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Performance obligation term         1 year                            
Recognition of revenue         $ 1,700,000,000                            
Loyalty program liability                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Payment term         30 days                            
Number of revenue components | component         2                            
Recognition of revenue         $ 2,221,000,000                            
Loyalty program liability | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Payment term         30 days                            
Number of revenue components | component         2                            
Recognition of revenue         $ 2,221,000,000                            
At-the-market Offering                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Issuance of shares of common stock, net of offering costs (in shares) | shares         24,150,764 68,561,487                          
Common shares, stock price (in dollars per share) | $ / shares         $ 19.26                            
Proceeds from issuance of common stock         $ 460,000,000                            
Common stock, remaining authorized amount         650,000,000                            
US Department Of The Treasury, CARES Act, Payroll Support Program Two                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Proceeds from government assistance, payroll support program, CARES Act         3,500,000,000                            
US Department Of The Treasury, CARES Act, Payroll Support Program Three                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Proceeds from government assistance, payroll support program, CARES Act         3,300,000,000                            
US Department Of The Treasury, CARES Act, Payroll Support Program One                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Proceeds from government assistance, payroll support program, CARES Act $ 6,000,000,000                                    
PSP1 Promissory Note                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Aggregate principal issued $ 1,800,000,000       1,800,000,000                            
Warrants, number of warrant shares of common stock | shares 14,100,000                                    
Exercise price of warrants (in dollars per share) | $ / shares $ 12.51                                    
Fair value of warrants $ 63,000,000                                    
PSP2 Promissory Note                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Aggregate principal issued         $ 1,000,000,000           $ 1,000,000,000                
Warrants, number of warrant shares of common stock | shares         6,600,000     6,600,000                      
Exercise price of warrants (in dollars per share) | $ / shares                     $ 15.66                
PSP3 Promissory Note                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Aggregate principal issued         $ 946,000,000                            
Warrants, number of warrant shares of common stock | shares         4,400,000                            
Exercise price of warrants (in dollars per share) | $ / shares                 $ 21.75                    
PSP2 Warrants                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Fair value of warrants               $ 76,000,000                      
PSP3 Warrants                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Fair value of warrants         $ 46,000,000                            
Other PSP1 Financial Assistance, CARES Act                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Proceeds from government assistance, payroll support program, CARES Act       $ 4,200,000,000                              
Other PSP2 Financial Assistance, CARES Act                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Proceeds from government assistance, payroll support program, CARES Act     $ 2,400,000,000                                
Other PSP3 Financial Assistance, CARES Act                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Proceeds from government assistance, payroll support program, CARES Act   $ 2,300,000,000                                  
Senior Notes | 5.50% Senior Notes                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Aggregate principal issued         $ 3,500,000,000         $ 3,500,000,000                  
Stated interest rate         5.50%         5.50%                  
Senior Notes | 5.75% Senior Notes                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Aggregate principal issued         $ 3,000,000,000         $ 3,000,000,000                  
Stated interest rate         5.75%         5.75%                  
Senior Notes | Senior Notes 6.50% Due 2025                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Aggregate principal issued                             $ 1,000,000,000        
Stated interest rate                             6.50%        
Reduction of debt discount         $ 22,000,000                            
Senior Notes | Senior Notes 6.50% Due 2025 | Cumulative Effect, Period of Adoption, Adjustment                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Equity component of convertible debt issued, net of tax and offering costs         415,000,000                            
Adjustments to additional paid in capital, net of tax         $ 320,000,000                            
Retained deficit                       $ 19,000,000              
Reduction of debt discount                       $ (389,000,000)              
Secured Debt | 5.50% Senior Notes                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Stated interest rate         5.50%                            
Secured Debt | 5.50% Senior Notes | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Stated interest rate         5.50%                            
Secured Debt | 5.75% Senior Notes                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Stated interest rate         5.75%                            
Secured Debt | 5.75% Senior Notes | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Stated interest rate         5.75%                            
Secured Debt | Term Loan Facility                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Aggregate principal issued         $ 3,500,000,000                            
Secured Debt | Enhanced Equipment Trust Certificates and Other Equipment Financing                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Proceeds from issuance of debt         94,000,000                            
Secured Debt | Special Facility Revenue Bonds                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Aggregate principal issued         150,000,000                            
Repayments of long-term debt         $ 62,000,000                            
Secured Debt | Special Facility Revenue Bonds | Minimum                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Stated interest rate         2.25%                            
Secured Debt | Special Facility Revenue Bonds | Minimum | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Stated interest rate         2.25%                            
Secured Debt | Special Facility Revenue Bonds | Maximum                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Stated interest rate         5.38%                            
Secured Debt | Special Facility Revenue Bonds | Maximum | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Stated interest rate         5.38%                            
Secured Debt | Equipment Loans and Other Notes Payable | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Proceeds from sale-leaseback transactions         $ 181,000,000                            
Secured Debt | Spare Parts Credit Facility April 2016 | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Repayments of long-term debt         950,000,000                            
Revolving Credit Facility                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, remaining borrowing capacity         2,800,000,000                            
Revolving Credit Facility | Short-term Revolving and Other Facilities                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, remaining borrowing capacity         568,000,000                            
Revolving Credit Facility | Short-term Revolving and Other Facilities | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, remaining borrowing capacity         568,000,000                            
Revolving Credit Facility | 2013 Credit  Facilities                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, remaining borrowing capacity         750,000,000                            
Revolving Credit Facility | 2013 Credit  Facilities | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, remaining borrowing capacity         750,000,000                            
Revolving Credit Facility | 2014 Credit  Facilities                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, remaining borrowing capacity         1,643,000,000                            
Revolving Credit Facility | 2014 Credit  Facilities | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, remaining borrowing capacity         1,643,000,000                            
Revolving Credit Facility | April 2016 Credit Facilities                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, remaining borrowing capacity         450,000,000                            
Revolving Credit Facility | April 2016 Credit Facilities | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, remaining borrowing capacity         450,000,000                            
Revolving Credit Facility | Secured Debt | 2013 Credit  Facilities                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, maximum borrowing capacity         750,000,000                            
Revolving Credit Facility | Secured Debt | 2013 Credit  Facilities | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, remaining borrowing capacity         0                     $ 0      
Repayments of long-term debt         750,000,000                            
Line of credit facility, maximum borrowing capacity                                   $ 750,000,000 $ 1,000,000,000
Revolving Credit Facility | Secured Debt | 2014 Credit  Facilities                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Line of credit facility, maximum borrowing capacity         1,643,000,000                            
Revolving Credit Facility | Secured Debt | 2014 Credit  Facilities | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Repayments of long-term debt         1,600,000,000                            
Line of credit facility, maximum borrowing capacity                                 $ 1,200,000,000 1,600,000,000 1,500,000,000
Revolving Credit Facility | Secured Debt | April 2016 Credit Facilities | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Repayments of long-term debt         450,000,000                            
Line of credit facility, maximum borrowing capacity                                   $ 450,000,000 $ 300,000,000
Line of Credit | Treasury Term Loan Facility                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Warrants, number of warrant shares of common stock | shares       4,400,000                              
Exercise price of warrants (in dollars per share) | $ / shares $ 12.51                                    
Line of Credit | Treasury Term Loan Facility | American Airlines, Inc.                                      
Unusual or Infrequent Item, or Both [Line Items]                                      
Repayments of long-term debt         550,000,000                            
Line of credit facility, maximum borrowing capacity         $ 7,500,000,000               $ 7,500,000,000 $ 5,500,000,000          
Warrants, number of warrant shares of common stock | shares       4,400,000                              
Exercise price of warrants (in dollars per share) | $ / shares $ 12.51