QUARTERLY FINANCIAL DATA (UNAUDITED) Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Quarterly Financial Data [Abstract]
Net sales	$ 6,851	$ 6,266	$ 26,041	$ 24,124	$ 24,210
Gross profit	505	509	1,932	1,687	1,339
Operating income	228	282	972	795	415
Net income	172	240	940	613	88
Net income attributable to Flex Ltd.	$ 168	$ 240	$ 936	$ 613	$ 88
Earnings per share attributable to the shareholders of Flex Ltd.
Basic (in dollars per share)	$ 0.36	$ 0.48	$ 1.97	$ 1.23	$ 0.17
Diluted (in dollars per share)	$ 0.36	$ 0.47	$ 1.94	$ 1.21	$ 0.17