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ACCRUED WORKERS' COMPENSATION COSTS - Schedule of Workers' Compensation Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Insurance [Abstract] |  |  |  |  |  |
Total accrued costs, end of period | $ 159 | $ 158 | $ 158 | $ 155 | $ 154 | $ 175
Collateral paid to carriers and offset against accrued costs | (4) |  | (4) |  |  |
Total accrued costs, net of carrier collateral offset | 155 |  | 154 |  |  |
Payable in less than 1 year (net of collateral paid to carriers) | 45 |  | 44 |  |  |
Payable in more than 1 year (net of collateral paid to carriers) | 110 |  | 110 |  |  |
Total accrued costs, net of carrier collateral offset | 155 |  | 154 |  |  |
Collateral paid, current | 1 |  | 1 |  |  |
Collateral paid, noncurrent | $ 3 |  | $ 3 |  |  |

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