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ACCRUED WORKERS' COMPENSATION COSTS - Summary of Activities in Liability for Unpaid Claims and Claims Adjustment Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense      
Total accrued costs, beginning of year $ 198 $ 205 $ 214
Incurred      
Current year 68 66 64
Prior years (32) (23) (20)
Total incurred 36 43 44
Paid      
Current year (10) (10) (8)
Prior years (35) (40) (45)
Total paid (45) (50) (53)
Total accrued costs, end of year $ 189 $ 198 $ 205