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Workers' Compensation Loss Reserves - Summary of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Total loss reserves, beginning of period | $ 255 | $ 255
Incurred |  |
Current year | 20 | 27
Prior years | (7) | 1
Total incurred | 13 | 28
Paid |  |
Current year | 0 | 0
Prior years | (18) | (22)
Total paid | (18) | (22)
Total loss reserves, end of period | $ 250 | $ 261

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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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