WORKFORCE REBALANCING AND SITE-RATIONALIZATION CHARGES - Classification of restructuring activity (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	18 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2023
RESTRUCTURING
Charges	$ 39	$ 107	$ 242
Cost of services
RESTRUCTURING
Charges	(3)	(3)	68
Selling, general and administrative expense.
RESTRUCTURING
Charges	3	13	22
Workforce rebalancing charges (benefits)
RESTRUCTURING
Charges	$ 39	$ 97	$ 152