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Related Parties and Related Commitments and Contingencies - Additional Information (Details) $ in Millions |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 28, 2025 USD ($) | Jan. 06, 2025 USD ($) installment | Oct. 01, 2024 USD ($) | Sep. 28, 2024 USD ($) | Dec. 27, 2024 USD ($) entity ¥ / $ | Dec. 29, 2023 USD ($) | Dec. 27, 2024 USD ($) entity ¥ / $ | Dec. 29, 2023 USD ($) | Jun. 28, 2024 USD ($)
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Number of legal entities | entity |  |  |  |  | 3 |  | 3 |  |
Investment funding commitments, percentage |  |  |  |  | 50.00% |  | 50.00% |  |
Manufacturing capacity percent operating |  |  |  |  | 100.00% |  | 100.00% |  |
Costs incurred associated with reduction in utilization |  |  |  |  | $ 0 | $ 107 | $ 0 | $ 249 |
Net proceeds from business divestiture |  |  |  |  |  |  | 191 | 0 |
Pre-tax gain on transaction |  |  |  |  | 113 | $ 0 | $ 113 | $ 0 |
Disposal Group, Held-for-Sale, Not Discontinued Operations | Sale Of Equity Interest In SanDisk Semiconductor Co. Ltd. |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage sold |  |  |  | 80.00% |  |  |  |  |
Unis Venture | Product Concentration Risk | Accounts Receivable Benchmark |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  | 6.00% |  | 7.00%
Flash Ventures | Future Building Depreciation Payments |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Other commitment |  |  |  |  | $ 303 |  | $ 303 |  |
Foreign currency exchange rate | ¥ / $ |  |  |  |  | 157.86 |  | 157.86 |  |
To be paid remainder of fiscal year |  |  |  |  | $ 60 |  | $ 60 |  |
To be paid year one |  |  |  |  | 30 |  | 30 |  |
To be paid year two |  |  |  |  | 111 |  | 111 |  |
To be paid year three |  |  |  |  | 89 |  | 89 |  |
To be paid year four |  |  |  |  | 13 |  | 13 |  |
Payments for building depreciation |  |  |  |  |  |  | 107 |  |
K1, K2, And Y7 Facilities | Future Building Depreciation Payments |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Other commitment |  |  |  |  | $ 944 |  | $ 944 |  |
Unis Venture |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 49.00% |  | 49.00% |  |
Unis Venture | Product Concentration Risk | Revenue from Contract with Customer |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  | 3.00% | 4.00% | 3.00% | 3.00% |
Unis Venture | Unissoft (Wuxi) Group Co Ltd. |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Partner's ownership in venture business |  |  |  |  | 51.00% |  | 51.00% |  |
SDSS |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 20.00% |  | 20.00% |  |
Ownership percentage sold |  |  |  |  |  |  | 80.00% |  |
Net proceeds from business divestiture |  |  | $ 262 | $ 659 |  |  |  |  |
Present value of outstanding consideration receivable |  |  |  |  | $ 370 |  | $ 370 |  |
Number of installments, period |  |  |  |  |  |  | 5 years |  |
Present value discount |  |  |  |  | 27 |  | $ 27 |  |
Retained interest |  |  |  |  | 158 |  | 158 |  |
SDSS | Yearly Installments |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from business divestiture |  |  |  | $ 37 |  |  |  |  |
SDSS | Other current assets |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Present value of outstanding consideration receivable |  |  |  |  | 243 |  | 243 |  |
SDSS | Other Noncurrent Assets |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Present value of outstanding consideration receivable |  |  |  |  | 127 |  | 127 |  |
SDSS | Forecast |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from business divestiture | $ 187 |  |  |  |  |  |  |  |
SDSS | Subsequent Event |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from business divestiture |  | $ 210 |  |  |  |  |  |  |
Number of installments | installment |  | 5 |  |  |  |  |  |  |
SDSS | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain on transaction |  |  |  |  |  |  | 113 |  |
Cash and cash equivalents |  |  |  |  | 71 |  | 71 |  |
Goodwill |  |  |  |  | $ 303 |  | $ 303 |  |
Western Digital Corp | Minimum |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Investment funding commitments, percentage |  |  |  |  | 49.90% |  | 49.90% |  |
Western Digital Corp | Maximum |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Investment funding commitments, percentage |  |  |  |  | 50.00% |  | 50.00% |  |
Related Party |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Payments for equity method investments |  |  |  |  | $ 1,100 | $ 800 | $ 2,000 | $ 1,800 |
Accounts payable |  |  |  |  | 369 |  | 369 |  | $ 313
Related Party | Flash Ventures |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  | 252 |  | 252 |  | $ 313
Affiliated Entity | Supply Agreement | SDSS |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Other commitment |  |  |  |  | $ 550 |  | 550 |  |
Other commitment period |  |  |  |  | 5 years |  |  |  |
Renewal term |  |  |  |  | 1 year |  |  |  |
Purchases under the Supply Agreement |  |  |  |  |  |  | 111 |  |
Accounts payable, due to SDSS |  |  |  |  | $ 117 |  | $ 117 |  |
Affiliated Entity | Minimum | Supply Agreement | SDSS |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Annual commitment period |  |  |  |  | 2 years |  |  |  |

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