Discontinued Operations - Additional Information (Details) - USD ($) shares in Millions, $ in Millions		1 Months Ended
	Feb. 21, 2025	Feb. 28, 2026	Jun. 30, 2025	Apr. 03, 2026
Variable interest rate Term Loan A-3 maturing 2027
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Settlement of debt, non-cash exchange (in shares)		5.8
Bridge Loan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt instrument, face amount		$ 1,500
Revolving Credit Facility \| Variable interest rate Term Loan A-3 maturing 2027 \| Sandisk Corporation (Flash)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Settlement of debt, non-cash exchange (in shares)			21.3
Sandisk Corporation (Flash)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Retained ownership percentage	19.90%
Investment owned (in shares)				1.7
Sandisk Corporation (Flash) \| Revolving Credit Facility \| Variable interest rate Term Loan A-3 maturing 2027
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate principal amount redeemed			$ 800
Separation Of Flash Business \| Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage sold	80.10%
Separation Of Flash Business \| Discontinued Operations, Disposed of by Means Other than Sale, Spinoff \| Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transition services agreement, support period		15 months

WESTERN DIGITAL CORP 10-Q