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Workers' Compensation Loss Reserves - Summary of Workers' Compensation Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
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Insurance [Abstract] |  |  |  |  |  |
Total loss reserves, end of period | $ 244 | $ 250 | $ 255 | $ 255 | $ 260 | $ 255
Collateral paid to carriers and offset against loss reserves | (20) |  | (23) |  |  |
Total loss reserves, net of carrier collateral offset | 224 |  | 232 |  |  |
Payable in less than 1 year (net of collateral paid to carriers of $5 and $6 at June 30, 2018 and December 31, 2017, respectively) | 67 |  | 67 |  |  |
Payable in more than 1 year (net of collateral paid to carriers of $15 and $17 at June 30, 2018 and December 31, 2017, respectively) | 157 |  | 165 |  |  |
Collateral paid to insurance carriers, current | 5 |  | 6 |  |  |
Collateral paid to insurance carriers, noncurrent | $ 15 |  | $ 17 |  |  |

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- Definition Collateral Paid To Insurance Carriers, Net Of Workers' Compensation Loss Reserves, Noncurrent + References No definition available. + Details
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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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- 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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