CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Cumulative Effect, Period of Adoption, Adjustment
Starting Balance (in shares) at Jun. 29, 2018			287
Total Seagate Technology plc Shareholders' Equity, Starting Balance at Jun. 29, 2018	$ 1,665	$ 34	$ 0	$ 6,377	$ (16)	$ (4,696)	$ 34
Increase (Decrease) in Stockholders' Equity
Net income	2,012					2,012
Other comprehensive loss	(18)				(18)
Issuance of ordinary shares under employee stock plans (in shares)			4
Issuance of ordinary shares under employee stock plans	69			69
Repurchases of shares (in shares)			(21)
Repurchases of shares	$ (966)					(966)
Tax withholding related to vesting of restricted stock units (in shares)	(1)		(1)
Tax withholding related to vesting of restricted share units	$ (31)					(31)
Dividends to shareholders ($2.52 per ordinary share)	(702)					(702)
Share-based compensation	99			99
Ending Balance (in shares) at Jun. 28, 2019			269
Total Seagate Technology plc Shareholders' Equity, Ending Balance at Jun. 28, 2019	2,162	$ (2)	$ 0	6,545	(34)	(4,349)	$ (2)
Increase (Decrease) in Stockholders' Equity
Net income	1,004					1,004
Other comprehensive loss	(32)				(32)
Issuance of ordinary shares under employee stock plans (in shares)			6
Issuance of ordinary shares under employee stock plans	103			103
Repurchases of shares (in shares)			(17)
Repurchases of shares	$ (847)					(847)
Tax withholding related to vesting of restricted stock units (in shares)	(1)		(1)
Tax withholding related to vesting of restricted share units	$ (40)					(40)
Dividends to shareholders ($2.52 per ordinary share)	(670)					(670)
Share-based compensation	109			109
Ending Balance (in shares) at Jul. 03, 2020			257
Total Seagate Technology plc Shareholders' Equity, Ending Balance at Jul. 03, 2020	1,787		$ 0	6,757	(66)	(4,904)
Increase (Decrease) in Stockholders' Equity
Net income	1,314					1,314
Other comprehensive loss	25				25
Issuance of ordinary shares under employee stock plans (in shares)			4
Issuance of ordinary shares under employee stock plans	108			108
Repurchases of shares (in shares)			(33)
Repurchases of shares	$ (2,047)					(2,047)
Tax withholding related to vesting of restricted stock units (in shares)	(1)		(1)
Tax withholding related to vesting of restricted share units	$ (33)					(33)
Dividends to shareholders ($2.52 per ordinary share)	(635)					(635)
Share-based compensation	112			112
Ending Balance (in shares) at Jul. 02, 2021			227
Total Seagate Technology plc Shareholders' Equity, Ending Balance at Jul. 02, 2021	$ 631		$ 0	$ 6,977	$ (41)	$ (6,305)