CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Ordinary Shares	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Unrealized Gain (Loss) on Derivative Instruments And Other	Foreign Currency Translation Adjustments	Total Accumulated Other Comprehensive Loss
Increase (Decrease) in Shareholders' Equity
Cumulative effect on opening equity of adopting accounting standards and other	$ 3,019	$ 39	$ 6,249	$ (3,144)	$ 39	$ (36)	$ (50)	$ (86)
Beginning balance (in shares) at Mar. 31, 2018			528,000,000
Beginning balance at Mar. 31, 2018	3,019	39	$ 6,249	(3,144)	39	(36)	(50)	(86)
Increase (Decrease) in Shareholders' Equity
Repurchase of Flex Ltd. ordinary shares at cost (in shares)			(18,000,000)
Repurchase of Flex Ltd. ordinary shares at cost	(189)		$ (189)
Exercise of stock options (in shares)			0
Exercise of stock options	0		$ 0
Issuance of Flex Ltd. vested shares under share bonus awards (in shares)			7,000,000
Net income	93			93
Stock-based compensation, net of tax	$ 76		$ 76
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-02
Cumulative effect on opening equity of adopting accounting standards and other	$ 2,973	22	$ 6,136	(3,012)	22	(42)	(109)	(151)
Total other comprehensive income (loss)	(65)					(6)	(59)	(65)
Ending balance (in shares) at Mar. 31, 2019			517,000,000
Ending balance at Mar. 31, 2019	2,973	22	$ 6,136	(3,012)	22	(42)	(109)	(151)
Increase (Decrease) in Shareholders' Equity
Cumulative effect on opening equity of adopting accounting standards and other	2,973	22	$ 6,136	(3,012)	22	(42)	(109)	(151)
Repurchase of Flex Ltd. ordinary shares at cost (in shares)			(24,000,000)
Repurchase of Flex Ltd. ordinary shares at cost	(260)		$ (260)
Exercise of stock options (in shares)			0
Exercise of stock options	1		$ 1
Issuance of Flex Ltd. vested shares under share bonus awards (in shares)			4,000,000
Net income	88			88
Stock-based compensation, net of tax	71		$ 71
Cumulative effect on opening equity of adopting accounting standards and other	2,831	$ 22	$ 5,948	(2,902)	$ 22	(82)	(133)	(215)
Total other comprehensive income (loss)	$ (64)					(40)	(24)	(64)
Ending balance (in shares) at Mar. 31, 2020	497,426,277		497,000,000
Ending balance at Mar. 31, 2020	$ 2,831		$ 5,948	(2,902)		(82)	(133)	(215)
Increase (Decrease) in Shareholders' Equity
Cumulative effect on opening equity of adopting accounting standards and other	2,831		$ 5,948	(2,902)		(82)	(133)	(215)
Repurchase of Flex Ltd. ordinary shares at cost (in shares)			(10,000,000)
Repurchase of Flex Ltd. ordinary shares at cost	(183)		$ (183)
Issuance of Flex Ltd. vested shares under share bonus awards (in shares)			5,000,000
Net income	613			613
Stock-based compensation, net of tax	79		$ 79
Cumulative effect on opening equity of adopting accounting standards and other	3,436		$ 5,844	(2,289)		(42)	(77)	(119)
Total other comprehensive income (loss)	$ 96					40	56	96
Ending balance (in shares) at Mar. 31, 2021	492,567,845		492,000,000
Ending balance at Mar. 31, 2021	$ 3,436		$ 5,844	(2,289)		(42)	(77)	(119)
Increase (Decrease) in Shareholders' Equity
Cumulative effect on opening equity of adopting accounting standards and other	$ 3,436		$ 5,844	$ (2,289)		$ (42)	$ (77)	$ (119)