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Commitments and Contingencies - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2020
USD ($)
aircraft
Jun. 30, 2020
USD ($)
aircraft
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
aircraft
Jun. 30, 2019
USD ($)
Commitments and Contingencies [Line Items]          
Restructuring charges | $   $ 2,454 $ 0 $ 2,454 $ 0
Future aircraft purchase commitments          
Commitments and Contingencies [Line Items]          
Future aircraft purchase commitments | $   14,240   $ 14,240  
LATAM          
Commitments and Contingencies [Line Items]          
Restructuring charges | $ $ 62 $ 62      
LATAM | A350-900          
Commitments and Contingencies [Line Items]          
Number of aircraft assumed       10  
Number of aircraft in terminated purchase agreement 4        
LATAM | A350-900 | Future aircraft purchase commitments          
Commitments and Contingencies [Line Items]          
Number of aircraft assumed   10      
Number of aircraft in terminated purchase agreement   4   4