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Commitments and Contingencies (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2016
Dec. 31, 2010
Dec. 31, 2015
Airport Project [Line Items]      
Assets constructed for others $ 1,150   $ 915
Construction obligation 989   $ 757
Fort Lauderdale-Hollywood International Airport      
Airport Project [Line Items]      
Total Expected Cost Of Airport Project 333    
Assets constructed for others 92    
HOU      
Airport Project [Line Items]      
Total Expected Cost Of Airport Project 150    
Proprietary Construction Reimbursement 22    
Los Angeles World Airport      
Airport Project [Line Items]      
Total Expected Cost Of Airport Project 526    
Assets constructed for others 313    
Construction obligation 313    
DAL      
Airport Project [Line Items]      
Assets constructed for others 538    
Municipal bonds issued   $ 456  
Municipal bonds principal remaining 439    
Construction obligation 525    
DAL Garage      
Airport Project [Line Items]      
Assets constructed for others 59    
Construction obligation $ 59