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ACCRUED WORKERS' COMPENSATION COSTS - Summary of Workers' Compensation Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Insurance [Abstract] |  |  |  |
Total accrued costs, end of year | $ 198 | $ 205 | $ 214 | $ 238
Collateral paid to carriers and offset against accrued costs | (8) | (8) |  |
Total loss reserves, net of carrier collateral offset | 190 | 197 |  |
Accrued workers' compensation costs, net | 55 | 59 |  |
Payable in more than 1 year | 135 | 138 |  |
Collateral paid, current | (2) | 3 |  |
Collateral paid, noncurrent | $ 6 | $ (5) |  |

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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=116884095&loc=d3e14764-158437 + Details
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