QUARTERLY FINANCIAL DATA (UNAUDITED) Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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
Quarterly Financial Data [Abstract]
Net sales	$ 6,169	$ 6,421	$ 6,933	$ 6,892	$ 6,984	$ 7,254	$ 7,303	$ 6,961	$ 26,415	$ 28,502	$ 24,633
Gross profit	437	433	519	476	465	499	525	487	1,865	1,976	1,780
Operating income	159	198	281	215	223	259	282	253	853	1,017	890
Net income from continuing operations	395	129	201	147	139	173	195	176	872	683	872
Net income from discontinued operations, net of tax	0	104	205	64	224	64	43	19	373	350	68
Net income	395	233	406	211	363	237	238	195	1,245	1,033	940
Net income attributable to noncontrolling interest and redeemable noncontrolling interest	0	36	178	25	221	7	6	6	239	240	4
Net income attributable to Flex Ltd.	$ 395	$ 197	$ 228	$ 186	$ 142	$ 230	$ 232	$ 189	$ 1,006	$ 793	$ 936
Weighted-average ordinary shares outstanding (in shares)	417	431	443	447	451	452	455	458	435	454	476
Weighted-average ordinary shares and ordinary share equivalents outstanding (in shares)	425	436	448	455	459	459	460	468	441	462	483
Earnings per share - basic
Continuing operations (in dollars per share)	$ 0.95	$ 0.30	$ 0.45	$ 0.33	$ 0.30	$ 0.38	$ 0.43	$ 0.38	$ 2.00	$ 1.50	$ 1.83
Discontinuing operations , net of tax (in dollars per share)	0	0.16	0.06	0.09	0.01	0.13	0.08	0.03	0.31	0.25	0.14
Basic earnings per share attributable to the shareholders of Flex Ltd (in dollars per share)	0.95	0.46	0.51	0.42	0.31	0.51	0.51	0.41	2.31	1.75	1.97
Earnings Per Share [Abstract]
Continuing operations (in dollars per share)	0.93	0.30	0.45	0.32	0.30	0.38	0.42	0.38	1.98	1.48	1.81
Discontinuing operations, net of tax (in dollars per share)	0	0.15	0.06	0.09	0.01	0.12	0.08	0.02	0.30	0.24	0.13
Diluted earnings per share attributable to the shareholders of Flex Ltd (in dollars per share)	$ 0.93	$ 0.45	$ 0.51	$ 0.41	$ 0.31	$ 0.50	$ 0.50	$ 0.40	$ 2.28	$ 1.72	$ 1.94