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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accrued Liabilities, Current [Abstract] |  |
Profitsharing and savings plans | $ 282 | $ 580
Vacation pay | 421 | 403
Health | 110 | 107
Workers compensation | 169 | 166
Property and income taxes | 73 | 68
Other | 260 | 425
Accrued liabilities | $ 1,315 | $ 1,749

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