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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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