SEGMENT REPORTING (Details) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			3
Number of reporting segments | segment			3
Net sales	$ 7,103	$ 7,756	$ 21,910	$ 22,869
Operating income	348	321	1,015	918
Intangible amortization	17	19	54	62
Stock-based compensation	39	27	125	80
Restructuring charges	74		100
Interest, net	36	54	112	150
Other charges (income), net	5	5	32	2
Income before income taxes	307	262	871	766
Operating Segments
Segment Reporting Information [Line Items]
Net sales	7,103	7,756	21,910	22,869
Operating income	477	372	1,293	1,078
Operating Segments | Flex Agility Solutions
Segment Reporting Information [Line Items]
Net sales	3,466	4,029	10,685	12,024
Operating income	174	181	488	523
Operating Segments | Flex Reliability Solutions
Segment Reporting Information [Line Items]
Net sales	2,956	3,225	9,561	9,493
Operating income	159	143	495	465
Operating Segments | Nextracker
Segment Reporting Information [Line Items]
Net sales	710	516	1,763	1,384
Operating income	162	60	356	133
Intersegment eliminations
Segment Reporting Information [Line Items]
Net sales	(29)	(14)	(99)	(32)
Corporate and Other
Segment Reporting Information [Line Items]
Operating income	(18)	(12)	(46)	(43)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Intangible amortization	17	19	54	62
Stock-based compensation	39	27	125	80
Restructuring charges	73	5	97	5
Legal and other	0	0	2	13
Interest, net	36	54	112	150
Other charges (income), net	$ 5	$ 5	$ 32	$ 2