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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
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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

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