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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accrued Liabilities, Current [Abstract] |  |  |
ProfitSharing and savings plans | $ 132 |  | $ 579
Aircraft and other lease related obligations | 39 |  | 40
Permanently grounded aircraft liability current | 14 | [1] | 34
Vacation pay | 372 |  | 365
Union Bonuses | 95 |  | 83
Health | 95 |  | 100
Workers compensation | 173 |  | 172
Property and income taxes | 56 |  | 57
Other | 158 |  | 270
Accrued liabilities | $ 1,134 |  | $ 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 first quarter 2018 decrease was primarily related to contractual rent obligations paid.

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