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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Total accrued costs, end of period | $ 236 | $ 238 | $ (250) | $ 255
Collateral paid to carriers and offset against accrued costs | (13) | (13) |  |
Total accrued costs, net of carrier collateral offset | 223 | 225 |  |
Payable in less than 1 year (net of collateral paid to carriers of $4 and $3 at March 31, 2019 and December 31, 2018, respectively) | 67 | 67 |  |
Payable in more than 1 year (net of collateral paid to carriers of $9 and $10 at March 31, 2019 and December 31, 2018, respectively) | 156 | 158 |  |
Worksite Employee [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Payable in less than 1 year (net of collateral paid to carriers of $4 and $3 at March 31, 2019 and December 31, 2018, respectively) | 67 | 67 |  |
Payable in more than 1 year (net of collateral paid to carriers of $9 and $10 at March 31, 2019 and December 31, 2018, respectively) | $ 156 | $ 158 |  |

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- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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