RESTRUCTURING ACTIVITIES AND IMPAIRMENT CHARGES (Narrative) (Details) - Invigorate Program - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 1	$ 6	$ 16	$ 8
Accounts Payable and Accrued Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 20		20		$ 44
Cost of services
Restructuring Cost and Reserve [Line Items]
Total restructuring charges		1	9	2
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total restructuring charges		$ 5	$ 12	$ 6