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Accrued Workers' Compensation Costs - Summary of Workers' Compensation Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total accrued costs, end of year | $ 238 | $ 255 | $ 255 | $ 190
Collateral paid to carriers and offset against accrued costs | (13) | (23) |  |
Total loss reserves, net of carrier collateral offset | 225 | 232 |  |
Accrued workers' compensation costs, net | 67 | 67 |  |
Payable in more than 1 year | 158 | 165 |  |
Collateral paid to carriers, current | 3 | 6 |  |
Collateral paid to carriers, noncurrent | 10 | 17 |  |
WSE |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total loss reserves, net of carrier collateral offset | 225 | 232 |  |
Accrued workers' compensation costs, net | 67 | 67 |  |
Payable in more than 1 year | $ 158 | $ 165 |  |

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- Definition Sum of adjustments to the estimated reserve for unpaid claims and claims adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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