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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Liabilities, Noncurrent [Abstract]        
Postretirement obligation   $ 232 $ 275  
Non-current lease-related obligations   48 85  
Permanently grounded aircraft liability noncurrent   0 13  
Other deferred compensation   247 237  
Other   111 76  
Other non-current liabilities   650 707  
Aircraft grounding charge $ 63 0 63 $ 0
Other Noncurrent Liabilities        
Other Liabilities, Noncurrent [Abstract]        
Derivative contracts   12 21  
Other Noncurrent Liabilities | Interest Rate Swap        
Other Liabilities, Noncurrent [Abstract]        
Derivative contracts [1]   $ 12 $ 21  
[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 15.