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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Accrued Liabilities, Current [Abstract]    
ProfitSharing and savings plans $ 432 $ 579
Aircraft and other lease related obligations 38 40
Permanently grounded aircraft liability current [1] 0 34
Vacation pay 392 365
Health 96 100
Workers compensation 166 172
Property and income taxes 61 57
Other 332 353
Accrued liabilities $ 1,517 $ 1,700
[1] These amounts represent the current and noncurrent portion of the Company's cease-use liability recorded as a result of the Company grounding its remaining leased Boeing 737-300 aircraft in 2017. The decrease was primarily related to contractual rent obligations paid.