TRANSACTIONS WITH FORMER PARENT - Related Party Revenue and Purchases (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		14 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Aug. 11, 2022
Related Party Transaction [Line Items]
Revenues	$ 4,073	$ 4,179	$ 8,266	$ 8,467
Cost of services	3,422	3,613	6,871	7,290
Payment for purchase of hardware from IBM			275	466
Related Party
Related Party Transaction [Line Items]
Revenues		82		287
Cost of services		421		1,382
IBM
Related Party Transaction [Line Items]
Ownership interest transferred						19.90%
IBM | Hardware, software and services
Related Party Transaction [Line Items]
Payment for purchase of hardware from IBM				89
Due from related party	265	265	265	$ 265	$ 265
Upgraded hardware period				2 years
Purchases from related party	$ 84	21	$ 110	$ 21	$ 193
Estimated useful lives (in years)	5 years		5 years		5 years
IBM | Related Party
Related Party Transaction [Line Items]
Revenues	$ 0	82	$ 0	287
Cost of services	$ 0	$ 421	$ 0	$ 1,382