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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.

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