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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense      
Total accrued costs, beginning of year $ 205 $ 214 $ 238
Incurred      
Current year 66 64 72
Prior years (23) (20) (31)
Total incurred 43 44 41
Paid      
Current year (10) (8) (14)
Prior years (40) (45) (51)
Total paid (50) (53) (65)
Total accrued costs, end of year $ 198 $ 205 $ 214