SEGMENTS - Reconciliation of consolidated pretax income (loss) to segment adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
SEGMENTS
Segment adjusted EBITDA	$ 596	$ 448	$ 1,232	$ 959
Workforce rebalancing charges	(39)	(3)	(97)	(6)
Charges related to ceasing to use leased / fixed assets and lease terminations			(10)
Transaction-related costs	(48)	(68)	(89)	(171)
Stock-based compensation expense	(25)	(28)	(48)	(54)
Interest expense	(31)	(19)	(61)	(38)
Depreciation of property, equipment and capitalized software	(220)	(221)	(431)	(449)
Amortization expense	(313)	(301)	(646)	(609)
Corporate expense not allocated to the segments	(21)	(20)	(45)	(40)
Other adjustments	(7)	(9)	(23)	(18)
Income (loss) before income taxes	$ (109)	$ (219)	$ (218)	$ (425)