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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability for Unpaid Claims and Claims Adjustment Expense      
Total accrued costs, beginning of year $ 214 $ 238 $ 255
Incurred      
Current year 64 72 80
Prior years (20) (31) (28)
Total incurred 44 41 52
Paid      
Current year (8) (14) (12)
Prior years (45) (51) (57)
Total paid (53) (65) (69)
Total accrued costs, end of year $ 205 $ 214 $ 238