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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Other Liabilities, Noncurrent [Abstract]    
Postretirement obligation $ 201 $ 169
Non-current lease-related obligations 165 193
Other deferred compensation 179 174
Deferred gains from sale and leaseback of aircraft 43 53
Other 98 44
Other non-current liabilities 760 1,255
Other Noncurrent Liabilities    
Other Liabilities, Noncurrent [Abstract]    
Derivative contracts 74 622
Other Noncurrent Liabilities | Interest Rate Swap    
Other Liabilities, Noncurrent [Abstract]    
Derivative contracts [1] $ 49 $ 61
[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.