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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Other Liabilities, Noncurrent [Abstract]    
Postretirement obligation $ 179 $ 169
Non-current lease-related obligations 164 193
Other deferred compensation 171 174
Deferred gains from sale and leaseback of aircraft 45 53
Other 107 44
Other noncurrent liabilities 931 1,255
Other Noncurrent Liabilities    
Other Liabilities, Noncurrent [Abstract]    
Liability derivative contracts, net 265 622
Fuel derivatives | Other Noncurrent Liabilities    
Other Liabilities, Noncurrent [Abstract]    
Liability derivative contracts, net [1] 211 561
Interest rate derivatives | Other Noncurrent Liabilities    
Other Liabilities, Noncurrent [Abstract]    
Liability derivative contracts, net [1] $ 54 $ 61
[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the unaudited Condensed Consolidated Balance Sheet in Note 5.