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RESTRUCTURING ACTIVITIES AND IMPAIRMENT CHARGES (Narrative) (Details) - Invigorate Program - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 1	$ 8	$ 17	$ 16
Accounts Payable and Accrued Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 9		9		$ 44
Cost of services
Restructuring Cost and Reserve [Line Items]
Total restructuring charges		1	10	3
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total restructuring charges		$ 7	$ 12	$ 13

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