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Commitments and Contingencies - Airport Projects (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Other Commitments [Line Items]    
Assets constructed for others $ 274 $ 164
LAX Terminal 1.5    
Other Commitments [Line Items]    
Outstanding remaining guaranteed obligation 289  
Total Not to Exceed Cost Of Airport Project 464  
LFMP Terminal    
Other Commitments [Line Items]    
Municipal bonds principal remaining 407  
Net present value of principal remaining $ 448