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Organization and Basis of Presentation - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 27, 2024 | Dec. 27, 2024 | Dec. 29, 2023 | Jun. 28, 2024 | Jun. 30, 2023 | Jul. 01, 2022 | Feb. 22, 2025 | Feb. 21, 2025
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment | $ (0) | $ (0) | $ 0 | $ 0 |  | $ 0 |  |
Subsequent Event |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Percent distribution of shares |  |  |  |  |  |  |  | 80.10%
Western Digital Corporation | Subsequent Event |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Percent distribution of shares |  |  |  |  |  |  |  | 80.10%
Western Digital Corporation | Sandisk Corporation | Subsequent Event |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 19.90% | 19.90%
The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Advertising costs |  |  |  | 31 | $ 35 | 47 |  |
Notional amount |  |  |  | 2,900 | 4,200 |  |  |
Goodwill impairment |  |  |  | $ 0 | $ 671 | $ 0 |  |
Likelihood of unfavorable settlement |  |  |  | If a position meets the more-likely-than-not level of certainty, it is recognized in the financial statements at the largest amount that has a greater than 50% likelihood of being realized upon ultimate settlement. |  |  |  |
Maximum percentage of deductions for ESPP |  |  |  | 10.00% |  |  |  |
Lease payments |  |  |  | $ 0 |  |  |  |
The Flash Business of Western Digital Corporation [Member] | Sandisk Corporation |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 20.00% |  |  |  |

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