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SEGMENT REPORTING - Comparative Information (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
Segment reporting information
Net sales	$ 6,169	$ 6,421	$ 6,933	$ 6,892	$ 6,984	$ 7,254	$ 7,303	$ 6,961	$ 26,415	$ 28,502	$ 24,633
Operating income	$ 159	$ 198	$ 281	$ 215	$ 223	$ 259	$ 282	$ 253	853	1,017	890
Intangible amortization									70	81	60
Stock-based compensation									113	101	88
Restructuring charges									175	27	15
Interest expense									207	230	166
Interest income									56	30	14
Other charges (income), net									44	6	(165)
Equity in earnings (losses) of unconsolidated affiliates									8	(4)	61
Income from continuing operations before income taxes									666	807	964
Loss contingency accrual recognized									50
Operating segments
Segment reporting information
Net sales									26,415	28,502	24,633
Operating income									1,267	1,232	1,070
Corporate and Other
Segment reporting information
Operating income									(68)	(69)	(81)
Segment Reconciling Items
Segment reporting information
Intangible amortization									70	81	60
Stock-based compensation									113	101	88
Restructuring charges									172	27	15
Customer related asset impairment									14	0	0
Legal and other									45	6	17
Equity in earnings (losses) of unconsolidated affiliates									8	(4)	61
Flex Agility Solutions | Operating segments
Segment reporting information
Net sales									13,923	15,769	14,027
Operating income									669	694	605
Flex Reliability Solutions | Operating segments
Segment reporting information
Net sales									12,492	12,733	10,606
Operating income									$ 666	$ 607	$ 546

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