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BOEING 737 MAX AIRCRAFT GROUNDING (Details)
$ in Millions
Jun. 30, 2021
aircraft
Jan. 31, 2020
USD ($)
Dec. 31, 2019
aircraft
Jul. 31, 2019
USD ($)
Mar. 13, 2019
aircraft
Unusual or Infrequent Item, or Both [Line Items]          
Aircrafts grounded under emergency order         34
After-tax charge for potential concessions and other considerations to customers for disruptions related to the 737 MAX grounding | $       $ 4,900  
Pre-tax charge related to estimated potential concessions and other considerations to customers related to the 737 MAX grounding | $   $ 2,600      
Aircrafts not delivered     41    
B-737-Max          
Unusual or Infrequent Item, or Both [Line Items]          
Number of 737 MAX owned 31        
Contract to Own Aircraft          
Unusual or Infrequent Item, or Both [Line Items]          
Aircrafts not delivered     28    
Contract to Lease Aircraft          
Unusual or Infrequent Item, or Both [Line Items]          
Aircrafts not delivered     13