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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Liabilities, Noncurrent [Abstract]        
Postretirement obligation   $ 275 $ 256  
Non-current lease-related obligations   85 125  
Permanently grounded aircraft liability noncurrent   13 [1] 0  
Other deferred compensation   237 204  
Other   76 108  
Other non-current liabilities   707 728  
Write off of Prepaid Rent On Grounded Aircraft   15    
Aircraft grounding charge $ 63 63 0 $ 0
Other Noncurrent Liabilities        
Other Liabilities, Noncurrent [Abstract]        
Derivative contracts   21 35  
Other Noncurrent Liabilities | Interest Rate Swap        
Other Liabilities, Noncurrent [Abstract]        
Derivative contracts [2]   $ 21 $ 35  
[1] These amounts represent the current and noncurrent portion of the Company's cease-use liability recorded during third quarter 2017, as a result of the Company grounding its remaining leased Boeing 737-300 aircraft on September 29, 2017. The liability reflects the remaining net lease payments due and certain lease return requirements that could have to be performed on these leased aircraft prior to their return to the lessors as of the cease-use date, but does not include the write–off of approximately $15 million in net prepaid rents associated with the aircraft at the grounding date, which were included in the $63 million charge recorded. See Note 7 for further information. This loss related to the grounding of the Classic fleet was recorded to Other operating expenses in the Consolidated Statement of Income during third quarter 2017. Approximately $3 million of this liability was paid during fourth quarter 2017.
[2] 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.