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Stock-based Compensation Expense (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 27, 2024 | Jun. 28, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount | The table below summarizes the total costs charged to the Company related to the Company’s employees’ participation in WDC’s equity incentive plan during the periods presented:
|  | Six Months Ended |
|  | December 27, 2024 |  |  | December 29, 2023 |
|  | (in millions) |
Cost of revenue |  | $ | 9 |  |  | $ | 10 |
Research and development |  |  | 40 |  |  |  | 35 |
Selling general, and administrative |  |  | 40 |  |  |  | 32 |
Total |  | $ | 89 |  |  | $ | 77 |
The Flash Business of Western Digital Corporation [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount |  | The table below summarizes total costs charged to the Business related to the Business’s employees’ participation in our Parent’s incentive plan during the years ended June 28, 2024, June 30, 2023, and July 1, 2022:
|  | 2024 |  |  | 2023 |  |  | 2022 |
|  | (in millions) |
Cost of revenue |  | $ | 20 |  |  | $ | 19 |  |  | $ | 18 |
Research and development |  |  | 71 |  |  |  | 88 |  |  |  | 94 |
Selling, general and administrative |  |  | 58 |  |  |  | 58 |  |  |  | 59 |
Total |  | $ | 149 |  |  | $ | 165 |  |  | $ | 171 |

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- Definition Line items represent financial concepts included in a table. 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