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Commitments and Contingencies - Airport Projects (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Airport Project [Line Items]        
Assets constructed for others   $ 1,543 $ 1,220  
AssetsConstructedForOthersNet [1]   1,448 1,156  
Depreciation and amortization   1,218 1,221 $ 1,015
Construction obligation [2]   1,390 1,078  
Los Angeles World Airport Terminal 1        
Airport Project [Line Items]        
Expected total airport modernization project cost   526    
Contractual Obligation   230    
Expected Total Cost Of Airport Project Nonproprietary   510    
Assets constructed for others [3]   433 344  
AssetsConstructedForOthersNet [1],[3]   417 336  
Construction obligation [2],[3]   433 344  
Los Angeles World Airport Terminal 1.5        
Airport Project [Line Items]        
Expected total airport modernization project cost   479    
Contractual Obligation   36    
Assets constructed for others [3]   31 0  
AssetsConstructedForOthersNet [1],[3]   31 0  
Construction obligation [2],[3]   31 0  
FLL        
Airport Project [Line Items]        
Expected total airport modernization project cost   333    
Assets constructed for others [3]   258 132  
AssetsConstructedForOthersNet [1],[3]   256 132  
Construction obligation [2],[3]   258 132  
DAL        
Airport Project [Line Items]        
Municipal bonds issued $ 456      
Municipal Bonds Principal Remaining   424    
Assets constructed for others [3]   543 538  
AssetsConstructedForOthersNet [1],[3]   474 486  
Construction obligation [2],[3]   516 522  
HOU        
Airport Project [Line Items]        
Assets constructed for others [4]   126 126  
AssetsConstructedForOthersNet [1],[4]   118 122  
Construction obligation [2],[4]   0 0  
DALGarage        
Airport Project [Line Items]        
Assets constructed for others [3]   152 80  
AssetsConstructedForOthersNet [1],[3]   152 80  
Construction obligation [2],[3]   $ 152 $ 80  
[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] Projects still in progress.
[4] Project completed in 2015 at Houston William P. Hobby Airport ("HOU").