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Related Parties and Related Commitments and Contingencies - Net Transfer From (to) Parent (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 27, 2024 | Sep. 27, 2024 | Dec. 29, 2023 | Sep. 29, 2023 | Dec. 27, 2024 | Dec. 29, 2023 | Jun. 28, 2024 | Jun. 30, 2023 | Jul. 01, 2022
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Net transfer from Parent | $ (92) | $ 583 | $ 152 | $ 19 |  |  | $ 275 | $ 376 | $ (922)
Non-cash transfers of liability for unrecognized tax benefits transferred from Parent |  |  |  |  | $ 14 | $ 0 |  |  |
Non-cash transfers of strategic investments from Parent |  |  |  |  | 7 | 0 |  |  |
Non-cash transfers of other assets and liabilities, net, from Parent |  |  |  |  | 37 | 0 |  |  |
Non-cash transfers of property, plant and equipment from Parent |  |  |  |  | 25 | 2 |  |  |
Non-cash transfers of Notes due to Parent transferred from Parent |  |  |  |  | 673 | 0 |  |  |
Non-cash transfers of Notes due from Parent transferred to Parent |  |  |  |  | 0 | 113 |  |  |
Non-cash transfers of deferred taxes from Parent |  |  |  |  | 0 | 8 |  |  |
The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Net transfer from Parent |  |  |  |  |  |  | 275 | 376 | (922)
Non-cash transfers of property, plant and equipment from Parent |  |  |  |  |  |  | 11 | 18 | 13
Non-cash transfers of Notes due from Parent transferred to Parent |  |  |  |  |  |  | (113) | (316) | 0
Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Net transfer from Parent |  |  |  |  | 491 | 171 |  |  |
Non-cash transfers of liability for unrecognized tax benefits transferred from Parent |  |  |  |  | 14 | 0 |  |  |
Accumulated other comprehensive loss transferred from Parent |  |  |  |  | 6 | 0 |  |  |
Non-cash transfers of strategic investments from Parent |  |  |  |  | (7) | 0 |  |  |
Non-cash transfers of other assets and liabilities, net, from Parent |  |  |  |  | (37) | 0 |  |  |
Non-cash transfers of property, plant and equipment from Parent |  |  |  |  | (25) | (2) |  |  |
Non-cash transfers of Notes due to Parent transferred from Parent |  |  |  |  | (673) | 0 |  |  |
Non-cash transfers of Notes due from Parent transferred to Parent |  |  |  |  | 0 | 113 |  |  |
Non-cash transfers of deferred taxes from Parent |  |  |  |  | 0 | (8) |  |  |
Net transfers from (to) Parent per Condensed Combined Statements of Cash Flows |  |  |  |  | $ (231) | $ 274 |  |  |
Related Party | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Non-cash transfers of property, plant and equipment from Parent |  |  |  |  |  |  | (11) | (18) | (13)
Non-cash transfers of Notes due from Parent transferred to Parent |  |  |  |  |  |  | 113 | 316 | 0
Non-cash transfers of deferred taxes from Parent |  |  |  |  |  |  | 17 | 2 | 2
Net transfers from (to) Parent per Condensed Combined Statements of Cash Flows |  |  |  |  |  |  | $ 394 | $ 676 | $ (933)

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