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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Other Liabilities, Noncurrent [Abstract]    
Postretirement obligation $ 256 $ 201
Non-current lease-related obligations 125 165
Other deferred compensation 204 179
Deferred gains from sale and leaseback of aircraft 30 43
Other 78 98
Other non-current liabilities 728 760
Other Noncurrent Liabilities    
Other Liabilities, Noncurrent [Abstract]    
Derivative contracts 35 74
Other Noncurrent Liabilities | Interest Rate Swap    
Other Liabilities, Noncurrent [Abstract]    
Derivative contracts [1] $ 35 $ 49
[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.