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Workers' Compensation Loss Reserves | 6 Months Ended
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Jun. 30, 2018
Insurance [Abstract] |
WORKERS' COMPENSATION LOSS RESERVES | WORKERS' COMPENSATION LOSS RESERVES The following table summarizes the workers’ compensation loss reserve activity for the three and six months ended June 30, 2018 and 2017:
| Three Months Ended June 30, | Six Months Ended June 30,
(in millions) | 2018 | 2017 | 2018 | 2017
Total loss reserves, beginning of period | $ | 250 |  | $ | 260 |  | $ | 255 |  | $ | 255 |
Incurred |  |  |  |
Current year | 19 |  | 20 |  | 39 |  | 48 |
Prior years | (6 | ) | 1 |  | (13 | ) | 1 |
Total incurred | 13 |  | 21 |  | 26 |  | 49 |
Paid |  |  |  |
Current year | (2 | ) | (5 | ) | (2 | ) | (6 | )
Prior years | (17 | ) | (21 | ) | (35 | ) | (43 | )
Total paid | (19 | ) | (26 | ) | (37 | ) | (49 | )
Total loss reserves, end of period | $ | 244 |  | $ | 255 |  | $ | 244 |  | $ | 255 |
The following summarizes workers' compensation liabilities on the condensed consolidated balance sheets:
(in millions) | June 30, 2018 | December 31, 2017
Total loss reserves, end of period | $ | 244 |  | $ | 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 |
Total loss reserves, net of carrier collateral offset | $ | 224 |  | $ | 232 |
Incurred claims related to prior years represent changes in estimates for ultimate losses on workers' compensation claims. For the three and six months ended June 30, 2018, the favorable development was primarily due to lower than expected severity of reported claims associated with office and non-office worker WSEs in recent accident years. As of June 30, 2018 and December 31, 2017, we had $62 million and $63 million, respectively, of collateral held by insurance carriers of which $20 million and $23 million, respectively, was offset against workers' compensation loss reserves as the agreements permit and are net settled of insurance obligations against collateral held. Collateral paid to each carrier for a policy year in excess of our loss reserves is recorded as workers' compensation collateral receivable.

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- Definition The entire disclosure for liabilities related to future policy benefits and unpaid claims and claim adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -URI http://asc.fasb.org/subtopic&trid=2560295 + Details
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