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ACCRUED WORKERS' COMPENSATION COSTS - Schedule of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Total accrued costs, beginning of period | $ 178 | $ 189 | $ 189 | $ 198
Incurred |  |  |  |
Current year | 13 | 18 | 47 | 51
Prior years | (2) | (3) | (25) | (23)
Total incurred | 11 | 15 | 22 | 28
Paid |  |  |  |
Current year | (4) | (4) | (6) | (6)
Prior years | (7) | (8) | (27) | (28)
Total paid | (11) | (12) | (33) | (34)
Total accrued costs, end of period | $ 178 | $ 192 | $ 178 | $ 192

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