ACCRUED WORKERS' COMPENSATION COSTS - Schedule of Workers' Compensation Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Insurance [Abstract]
Total accrued costs, end of period	$ 159	$ 158	$ 158	$ 155	$ 154	$ 175
Collateral paid to carriers and offset against accrued costs	(4)		(4)
Total accrued costs, net of carrier collateral offset	155		154
Payable in less than 1 year (net of collateral paid to carriers)	45		44
Payable in more than 1 year (net of collateral paid to carriers)	110		110
Total accrued costs, net of carrier collateral offset	155		154
Collateral paid, current	1		1
Collateral paid, noncurrent	$ 3		$ 3