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Accrued Workers' Compensation Costs (Tables) | 12 Months Ended
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Dec. 31, 2018
Insurance [Abstract] |
Summary of Activities for Unpaid Claims, Claims Adjustment Expenses and Workers' Compensation Liabilities | The following table summarizes the accrued workers’ compensation cost activity for the years ended December 31, 2018, 2017 and 2016:
| Year Ended December 31,
(in millions) | 2018 | 2017 | 2016
Total accrued costs, beginning of year | $ | 255 |  | $ | 255 |  | $ | 190 |
Incurred |  |  |
Current year | 80 |  | 98 |  | 113 |
Prior years | (28 | ) | (6 | ) | 28 |
Total incurred | 52 |  | 92 |  | 141 |
Paid |  |  |
Current year | (12 | ) | (14 | ) | (14 | )
Prior years | (57 | ) | (78 | ) | (62 | )
Total paid | (69 | ) | (92 | ) | (76 | )
Total accrued costs, end of year | $ | 238 |  | $ | 255 |  | $ | 255 |
The following table summarizes workers' compensation liabilities on the consolidated balance sheets:
(in millions) |  | December 31, 2018 | December 31, 2017
Total accrued costs, end of year |  | $ | 238 |  | $ | 255 |
Collateral paid to carriers and offset against accrued costs |  | (13 | ) | (23 | )
Total accrued costs, net of carrier collateral offset |  | $ | 225 |  | $ | 232 |
Payable in less than 1 year (net of collateral paid to carriers of $3 and $6 as of December 31, 2018 and 2017, respectively) |  | 67 |  | 67 |
Payable in more than 1 year (net of collateral paid to carriers of $10 and $17 as of December 31, 2018 and 2017, respectively) |  | 158 |  | 165 |
Total accrued costs, net of carrier collateral offset |  | $ | 225 |  | $ | 232 |

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- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims. + 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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