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Investments (Tables)
 6 Months Ended
Jun. 30, 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)June 30, 2021December 31, 2020June 30, 2021December 31, 2020
Wheels UpFair Value24 %24 %$520 $210 
Hanjin-KALFair Value13 %13 %517 512 
Air France-KLMFair Value6 %9 %181 235 
China EasternFair Value3 %3 %197 201 
CLEARFair Value6 %6 %331 120 
Unifi AviationEquity Method49 %49 %162 154 
Other investmentsVarious234 233 
Equity investments$2,143 $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)June 30, 2021December 31, 2020June 30, 2021December 31, 2020
Wheels UpFair Value24 %24 %$520 $210 
Hanjin-KALFair Value13 %13 %517 512 
Air France-KLMFair Value6 %9 %181 235 
China EasternFair Value3 %3 %197 201 
CLEARFair Value6 %6 %331 120 
Unifi AviationEquity Method49 %49 %162 154 
Other investmentsVarious234 233 
Equity investments$2,143 $1,665