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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Accrued Liabilities, Current [Abstract]    
ProfitSharing and savings plans $ 450 $ 645
Aircraft and other lease related obligations 41 55
Permanently grounded aircraft liability current 31 [1] 0
Vacation pay 348 355
Contract ratification bonuses 69 188
Health 93 96
Workers compensation 174 183
Property and income taxes 79 68
Other 228 237
Accrued liabilities 1,593 1,985
Fuel derivatives | Accrued Liabilities    
Accrued Liabilities, Current [Abstract]    
Derivative contracts $ 80 $ 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.