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ACCRUED WORKERS' COMPENSATION COSTS - Schedule of Activities in Liability for Unpaid Claims and Claims Adjustment Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense |  |  |
Total accrued costs, beginning of year | $ 189 | $ 198 | $ 205
Incurred |  |  |
Current year | 66 | 68 | 66
Prior years | (36) | (32) | (23)
Total incurred | 30 | 36 | 43
Paid |  |  |
Current year | (10) | (10) | (10)
Prior years | (34) | (35) | (40)
Total paid | (44) | (45) | (50)
Total accrued costs, end of year | $ 175 | $ 189 | $ 198

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