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ACCRUED WORKERS' COMPENSATION COSTS - Schedule of Workers' Compensation Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Insurance [Abstract] |  |  |  |  |  |
Total accrued costs, end of period | $ 154 | $ 175 | $ 175 | $ 178 | $ 187 | $ 189
Collateral paid to carriers and offset against accrued costs | (4) |  | (5) |  |  |
Total accrued costs, net of carrier collateral offset | 150 |  | 170 |  |  |
Payable in less than 1 year (net of collateral paid to carriers of $1 and $1 at June 30, 2024 and December 31, 2023, respectively) | 43 |  | 50 |  |  |
Payable in more than 1 year  (net of collateral paid to carriers of $3 and $4 at June 30, 2024 and December 31, 2023, respectively) | 107 |  | 120 |  |  |
Total accrued costs, net of carrier collateral offset | 150 |  | 170 |  |  |
Net of collateral paid to carriers, payable in less than one year | 1 |  | 1 |  |  |
Net of collateral paid to carriers, payable in more than 1 year | $ 3 |  | $ 4 |  |  |

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