Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Jul. 02, 2021	Aug. 02, 2021	Jan. 01, 2021
Document And Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jul. 02, 2021
Document Transition Report	false
Entity File Number	001-31560
Entity Incorporation, State or Country Code	L2
Entity Tax Identification Number	98-1597419
Entity Address, Address Line One	38/39 Fitzwilliam Square
Entity Address, City or Town	Dublin 2
Entity Address, Country	IE
Entity Address, Postal Zip Code	D02 NX53
City Area Code	353) (1)
Local Phone Number	234-3136
Title of 12(b) Security	Ordinary Shares, par value $0.00001 per share
Trading Symbol	STX
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 14,800
Entity Common Stock, Shares Outstanding		227,603,061
Entity Central Index Key	0001137789
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--07-02
Entity Registrant Name	Seagate Technology Holdings plc