EARNINGS PER SHARE - Weighted Average Shares used to Calculate EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Basic earnings per share attributable to the shareholders of Flex Ltd.
Net income	$ 172	$ 240	$ 940	$ 613	$ 88
Net income attributable to redeemable noncontrolling interest			4	0	0
Net income attributable to Flex Ltd.	$ 168	$ 240	$ 936	$ 613	$ 88
Shares used in computation:
Weighted-average ordinary shares outstanding (in shares)			476	499	509
Basic earnings per share (in dollars per share)	$ 0.36	$ 0.48	$ 1.97	$ 1.23	$ 0.17
Diluted earnings per share attributable to the shareholders of Flex Ltd.
Net income	$ 172	$ 240	$ 940	$ 613	$ 88
Net income attributable to redeemable noncontrolling interest			4	0	0
Net income attributable to Flex Ltd.	$ 168	$ 240	$ 936	$ 613	$ 88
Shares used in computation:
Weighted-average ordinary shares outstanding (in shares)			476	499	509
Weighted-average ordinary share equivalents from stock options and awards (in shares)			7	7	3
Weighted-average ordinary shares and ordinary share equivalents outstanding (in shares)			483	506	512
Diluted earnings per share (in dollars per share)			$ 1.94	$ 1.21	$ 0.17