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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Supplemental Financial Data [Line Items]    
Profitsharing and savings plans $ 580 $ 579
Aircraft and other lease related obligations 37 40
Permanently grounded aircraft liability current 0 34
Vacation pay 403 365
Health 107 100
Workers compensation 166 172
Property and income taxes 68 57
Other 388 353
Accrued liabilities 1,749 1,700
Interest rate derivatives | Accrued Liabilities    
Supplemental Financial Data [Line Items]    
Derivative contracts $ 2 $ 1