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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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- Definition

Percent of commitment by the Company to fund a venture's investment in situations where the venture's sales are insufficient to cover the investments.

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No definition available.

+ Details

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- Definition

Manufacturing Capacity Percent Operating

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+ Details

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- Definition

Number of Legal Entities

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No definition available.

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- Definition

Other Commitment, Annual Commitment, Period

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No definition available.

+ Details

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- Definition

Other Commitment, Renewal Term

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- Definition

Other Commitment, Term

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No definition available.

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- Definition

Partner's Ownership In Venture Business

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No definition available.

+ Details

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- Definition

Sale of Equity Method Investments, Number Of Installments

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No definition available.

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- Definition

Sale of Equity Method Investments, Number Of Installments, Period

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No definition available.

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