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ACCRUED WORKERS' COMPENSATION COSTS - Schedule of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Total accrued costs, beginning of period | $ 187 | $ 199 | $ 189 | $ 198
Incurred |  |  |  |
Current year | 18 | 16 | 34 | 33
Prior years | (17) | (15) | (23) | (20)
Total incurred | 1 | 1 | 11 | 13
Paid |  |  |  |
Current year | (1) | (2) | (2) | (2)
Prior years | (9) | (9) | (20) | (20)
Total paid | (10) | (11) | (22) | (22)
Total accrued costs, end of period | $ 178 | $ 189 | $ 178 | $ 189

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