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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Supplemental Financial Data [Line Items]    
Profitsharing and savings plans $ 579 $ 645
Aircraft and other lease related obligations 40 55
Permanently grounded aircraft liability current 34 [1] 0
Vacation pay 365 355
Union Bonuses 83 188
Health 100 96
Workers compensation 172 183
Property and income taxes 57 68
Other 346 237
Accrued liabilities 1,777 1,985
Permanently grounded aircraft liability paid current period 3  
Interest rate derivatives | Accrued Liabilities    
Supplemental Financial Data [Line Items]    
Derivative contracts [2] 1 0
Fuel derivatives | Accrued Liabilities    
Supplemental Financial Data [Line Items]    
Derivative contracts [2] $ 0 $ 158
[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.