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Investments (Tables)
 3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary of equity investments ownership and carrying value - fair value
Equity investments ownership interest and carrying value
Accounting TreatmentOwnership InterestCarrying Value
(in millions)March 31, 2021December 31, 2020March 31, 2021December 31, 2020
Wheels UpFair Value24 %24 %$520 $210 
Hanjin-KALFair Value13 %13 %447 512 
Air France-KLMFair Value9 %9 %225 235 
China EasternFair Value3 %3 %219 201 
Unifi AviationEquity Method49 %49 %165 154 
Other investmentsVarious353 353 
Equity investments$1,929 $1,665 
Summary of equity investments ownership and carrying value - equity method
Equity investments ownership interest and carrying value
Accounting TreatmentOwnership InterestCarrying Value
(in millions)March 31, 2021December 31, 2020March 31, 2021December 31, 2020
Wheels UpFair Value24 %24 %$520 $210 
Hanjin-KALFair Value13 %13 %447 512 
Air France-KLMFair Value9 %9 %225 235 
China EasternFair Value3 %3 %219 201 
Unifi AviationEquity Method49 %49 %165 154 
Other investmentsVarious353 353 
Equity investments$1,929 $1,665