WORKFORCE REBALANCING AND SITE-RATIONALIZATION CHARGES - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	18 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2023	Mar. 31, 2023
RESTRUCTURING
Balance at beginning of period		$ 58
Charges	$ 39	107	$ 242
Cash payments		(112)
Non-cash adjustments		(9)
Balance at end of period	45	45	45
Workforce Rebalancing Charges
RESTRUCTURING
Balance at beginning of period		55
Charges		97
Cash payments		(107)
Non-cash adjustments		(1)
Balance at end of period	44	44	44
Historic workforce rebalancing liabilities	$ 33	33	$ 33	$ 42
Charges Related to Ceasing to Use Leased Assets
RESTRUCTURING
Charges		3
Non-cash adjustments		(3)
Charges Related to Lease Terminations
RESTRUCTURING
Balance at beginning of period		3
Charges		(3)
Charges Related to Ceasing to Use Fixed Assets
RESTRUCTURING
Charges		10
Cash payments		(5)
Non-cash adjustments		(5)
Workforce Rebalancing Liabilities Inherited from Former Parent
RESTRUCTURING
Cash payments		(6)
Non-cash adjustments		$ 2