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ACCRUED WORKERS' COMPENSATION COSTS - Summary of Workers' Compensation Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Insurance [Abstract]        
Total accrued costs, end of year $ 205 $ 214 $ 238 $ 255
Collateral paid to carriers and offset against accrued costs (8) (9)    
Total loss reserves, net of carrier collateral offset 197 205    
Accrued workers' compensation costs, net 59 61    
Payable in more than 1 year 138 144    
Collateral paid, current (3) (3)    
Collateral paid, noncurrent $ (5) $ (6)