SEGMENTS - Reconciliation of consolidated totals to segment information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
SEGMENTS
Income (loss) before income taxes	$ (189)	$ (403)
Workforce rebalancing charges		52
Transaction-related costs	58	55
Stock-based compensation	31	16
Interest expense	21	14
Depreciation expense	246	339
Amortization expense	326	330
Corporate expense not allocated to the segments	56	40
Other adjustments	43	7
Segment adjusted EBITDA	$ 592	$ 450