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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
aircraft
Dec. 31, 2020
USD ($)
aircraft
Dec. 31, 2019
USD ($)
Mar. 13, 2019
aircraft
Dec. 31, 2018
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Payroll support and voluntary employee programs, net $ 2,960 $ 967 $ 0    
Other (gains) losses, net 22 (158) (8)    
Stockholders' equity attributable to parent 10,414 8,876 9,832   $ 9,853
Impairment charges $ 12 $ 32      
Number of aircraft under accelerated retirement | aircraft 20 8      
Total operating revenues $ 15,790 $ 9,048 22,428    
Advertising costs 185 156 212    
Capitalized computer software, net 886 697      
Computer software depreciation expense $ 213 203 177    
Number of aircraft grounded | aircraft       34  
Length of agreements with co-brand, payment, and loyalty partners (in years) 10 years        
Unionized Employees concentration risk | Workforce Subject to Collective Bargaining Arrangements          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Full-time employees unionized (as a percent) 82.00%        
Unionized Employees concentration risk | Number of Employees, Total          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Full-time employees unionized (as a percent) 77.00%        
Latin America          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Total operating revenues $ 475 184 615    
North America          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Total operating revenues 15,300 8,900 21,800    
Other Intangible Assets          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Gross carrying amount of indefinite-lived intangible assets $ 295 295      
Flight equipment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Maximum percentage of cost estimated as residual value (as a percent) 15.00%        
Ground property and equipment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Maximum percentage of cost estimated as residual value (as a percent) 10.00%        
Minimum percentage of cost estimated residual value (as a percent) 0.00%        
Maximum | Flight equipment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Useful life (in years) 25 years        
Maximum | Ground property and equipment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Useful life (in years) 30 years        
Maximum | Software          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Useful life (in years) 15 years        
Minimum | Ground property and equipment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Useful life (in years) 5 years        
Minimum | Software          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Useful life (in years) 5 years        
Fuel derivative contracts          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Collateral deposits $ 175 34      
Interest rate derivatives | Other noncurrent liabilities          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Collateral deposits 0        
Retained earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' equity attributable to parent 15,774 14,777 17,945   15,967
Accumulated other comprehensive income (loss)          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' equity attributable to parent $ 388 (105) $ (61)   20
Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' equity attributable to parent   0     55
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' equity attributable to parent   20     $ 55
Cumulative Effect, Period of Adoption, Adjustment | Accumulated other comprehensive income (loss)          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' equity attributable to parent   $ (20)