Cover Page - USD ($) $ in Billions	12 Months Ended
	Jul. 01, 2022	Aug. 11, 2022	Dec. 31, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jul. 01, 2022
Current Fiscal Year End Date	--07-01
Document Transition Report	false
Entity File Number	1-8703
Entity Registrant Name	WESTERN DIGITAL CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	33-0956711
Entity Address, Address Line One	5601 Great Oaks Parkway
Entity Address, City or Town	San Jose,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95119
City Area Code	408
Local Phone Number	717-6000
Title of 12(b) Security	Common Stock, $0.01 Par Value Per Share
Trading Symbol	WDC
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			$ 17.0
Entity Common Stock, Shares Outstanding (in shares)		314,492,541
Documents Incorporated by Reference	Part III incorporates by reference certain information from the registrant’s definitive proxy statement (the “Proxy Statement”) for the 2022 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days after the end of the 2022 fiscal year. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part hereof.
Entity Central Index Key	0000106040
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false