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Western Digital Corporation 401(k) Plan - Additional Information (Details) - USD ($) $ in Millions			12 Months Ended
	Jan. 01, 2022	Dec. 31, 2021	Jun. 30, 2023	Jul. 01, 2022	Jul. 02, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent of match				50.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay				6.00%
Defined contribution plan, employer discretionary contribution amount			$ 22	$ 36	$ 34
Pre-Tax
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, maximum annual contributions per employee, percent	85.00%	75.00%
Pre Tax and Post Tax
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, maximum annual contributions per employee, percent	10.00%	10.00%
Post-Tax
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, maximum annual contributions per employee, percent		10.00%

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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