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Investments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 17, 2022
Mar. 31, 2022
Dec. 31, 2021
Grupo Aeromexico      
Investments [Line Items]      
New capital stock after consolidation and exchange as percentage of previously outstanding (percent) 0.01%    
Grupo Aeromexico      
Investments [Line Items]      
Carrying value   $ 432 $ 0
Ownership interest (percent) 20.00% 20.00% 51.00%
Virgin Atlantic      
Investments [Line Items]      
Carrying value   $ 0  
Ownership interest (percent)   49.00%  
LATAM      
Investments [Line Items]      
Carrying value   $ 0  
Estimated ownership pending restructuring process (percent)   10.00%  
Grupo Aeromexico      
Investments [Line Items]      
Investment in equity method investment $ 100    
LATAM      
Investments [Line Items]      
Noncurrent financing receivable   $ 175