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Commitments and Contingencies - Airport Projects (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Airport Project [Line Items]        
Assets constructed for others   $ 1,768 $ 1,543  
Assets constructed for others, net [1]   1,637 1,448  
Depreciation and amortization   1,201 1,218 $ 1,221
Construction obligation [2]   1,701 1,390  
Los Angeles World Airport Terminal 1        
Airport Project [Line Items]        
Expected total airport modernization project cost   526    
Contractual Obligation   111    
Expected Total Cost Of Airport Project Nonproprietary   510    
Assets constructed for others   485 433  
Assets constructed for others, net [1]   459 417  
Construction obligation [2]   476 433  
Los Angeles World Airport Terminal 1.5        
Airport Project [Line Items]        
Expected total airport modernization project cost   479    
Contractual Obligation   106    
Assets constructed for others [3]   99 31  
Assets constructed for others, net [1],[3]   99 31  
Construction obligation [2],[3]   99 31  
FLL        
Airport Project [Line Items]        
Expected total airport modernization project cost   333    
Assets constructed for others   313 258  
Assets constructed for others, net [1]   304 256  
Construction obligation [2]   308 258  
DAL        
Airport Project [Line Items]        
Municipal bonds issued $ 456      
Municipal Bonds Principal Remaining   416    
Assets constructed for others   545 543  
Assets constructed for others, net [1]   460 474  
Construction obligation [2]   502 516  
HOU        
Airport Project [Line Items]        
Assets constructed for others [4]   126 126  
Assets constructed for others, net [1],[4]   115 118  
Construction obligation [2],[4]   116 0  
DALGarage        
Airport Project [Line Items]        
Assets constructed for others   200 152  
Assets constructed for others, net [1]   200 152  
Construction obligation [2]   $ 200 $ 152  
[1] Net of accumulated depreciation.
[2] Construction obligation will be reduced through future facility rent payments. These future payments are not fixed per the lease agreement, but are variable and fluctuate based on various market and other factors outside the control of the Company.
[3] Project still in progress.
[4] Project completed in 2015 at Houston William P. Hobby Airport ("HOU").