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ACCRUED WORKERS' COMPENSATION COSTS - Summary of Workers' Compensation Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Insurance [Abstract]        
Total accrued costs, end of year $ 198 $ 205 $ 214 $ 238
Collateral paid to carriers and offset against accrued costs (8) (8)    
Total loss reserves, net of carrier collateral offset 190 197    
Accrued workers' compensation costs, net 55 59    
Payable in more than 1 year 135 138    
Collateral paid, current (2) 3    
Collateral paid, noncurrent $ 6 $ (5)