DISCONTINUED OPERATIONS - Income Statement Disclosures (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 29, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jul. 01, 2022	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income from discontinued operations, net of tax	$ 0	$ 104	$ 205	$ 64	$ 224	$ 64	$ 43	$ 19	$ 373	$ 350	$ 68
Net income from discontinued operations attributable to Flex Ltd.									134	110	64
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Nextracker
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales									1,664	1,844	1,408
Cost of sales									1,198	1,555	1,256
Gross profit									466	289	152
Selling, general and administrative expenses									145	121	62
Intangible amortization									0	1	8
Operating income									321	167	82
Interest, net									1	1	0
Other charges (income), net									(2)	(1)	1
Income before income taxes									322	167	81
(Benefit from) provision for income taxes									(51)	(183)	13
Net income from discontinued operations, net of tax									373	350	68
Net income from discontinued operations attributable to noncontrolling interest and redeemable noncontrolling interest									239	240	4
Net income from discontinued operations attributable to Flex Ltd.									$ 134	$ 110	$ 64