RESTRUCTURING ACTIVITIES (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Accounts Payable and Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 6	$ 6		$ 9
Cost of services
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	2	3	$ (1)
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 3	$ 4	$ (2)