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Impact of the COVID-19 Pandemic - Valuation of Long-Lived Assets (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
aircraft
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
aircraft
Property, Plant and Equipment [Line Items]      
Flight equipment and other long-lived assets $ 28,500   $ 28,500
Number of aircraft removed from active service | aircraft     600
Retired aircraft      
Property, Plant and Equipment [Line Items]      
Cumulative net book value of retired aircraft 370   $ 370
MD-88 fleet      
Property, Plant and Equipment [Line Items]      
Impairment charge related to retired fleet   $ 22  
777 fleet      
Property, Plant and Equipment [Line Items]      
Impairment charge related to retired fleet 1,400    
MD-90 fleet      
Property, Plant and Equipment [Line Items]      
Impairment charge related to retired fleet 330    
737-700 fleet      
Property, Plant and Equipment [Line Items]      
Impairment charge related to retired fleet 220    
767-300ER      
Property, Plant and Equipment [Line Items]      
Impairment charge related to retired fleet $ 180    
Number of aircraft retired | aircraft 7    
A320      
Property, Plant and Equipment [Line Items]      
Impairment charge related to retired fleet $ 60    
Number of aircraft retired | aircraft 10