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Fair Value - Fair value, by balance sheet grouping (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Assets    
Available-for-sale investment securities $ 337 $ 800
Recurring    
Assets    
Cash equivalents 665 1,515
Available-for-sale investment securities 337 800
Equity Investment Securities 8 26
Aircraft fuel derivatives 3  
Recurring | Level 1    
Assets    
Cash equivalents 665 1,515
Available-for-sale investment securities 0 0
Equity Investment Securities 8 26
Aircraft fuel derivatives 0  
Recurring | Level 2    
Assets    
Cash equivalents 0 0
Available-for-sale investment securities 324 800
Equity Investment Securities 0  
Aircraft fuel derivatives 3  
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Available-for-sale investment securities 13 0
Equity Investment Securities 0 $ 0
Aircraft fuel derivatives $ 0