SEGMENTS - Reconciliation of segment adjusted EBITDA to consolidated pretax income (loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
SEGMENTS
Segment adjusted EBITDA	$ 577	$ 636
Workforce rebalancing charges	(36)	(58)
Charges related to ceasing to use leased / fixed assets and lease terminations	(9)	(10)
Transaction-related costs	(20)	(42)
Stock-based compensation expense	(24)	(22)
Interest expense	(28)	(29)
Depreciation of property, equipment and capitalized software	(127)	(210)
Amortization expense	(317)	(333)
Corporate expense not allocated to the segments	(21)	(24)
Other adjustments	32	(16)
Income (loss) before income taxes	$ 64	$ (109)