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Related Parties and Related Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2019 | Jan. 01, 2021 | Jan. 03, 2020 | Jan. 01, 2021 | Jan. 03, 2020 | Jul. 03, 2020
Guarantor Obligations [Line Items] |  |  |  |  |  |
Accounts payable to related parties |  | $ 393 |  | $ 393 |  | $ 407
Investment funding commitments |  | 50.00% |  | 50.00% |  |
Costs associated with underutilized capacity as a result of unexpected power outage incident |  |  |  |  | $ 68 |
Partial insurance recovery of business interruption |  |  |  | $ 75 |  |
Western Digital Corp | Minimum |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Investment funding commitments |  | 49.90% |  | 49.90% |  |
Western Digital Corp | Maximum |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Investment funding commitments |  | 50.00% |  | 50.00% |  |
Flash Ventures |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Investments in Flash Ventures |  | $ 1,210 | $ 648 | $ 2,190 | $ 1,330 |
Accounts payable to related parties |  | 393 |  | 393 |  | $ 407
Flash Ventures |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Remaining committed prepayments |  | $ 149 |  | $ 149 |  |
Unis Venture |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 49.00% |  | 49.00% |  |
Unissoft (Wuxi) Group Co Ltd. | Unis Venture |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Partner's ownership in venture business |  | 51.00% |  | 51.00% |  |
Prepayments of Future Depreciation | Flash Ventures |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Other commitment | $ 360 |  |  |  |  |
Other commitment, period | 3 years |  |  |  |  |
Revenue from Contract with Customer | Unis Venture | Product Concentration Risk |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Concentration risk, percentage |  | 3.00% | 1.00% | 3.00% | 1.00% |
Accounts Receivable | Product Concentration Risk | Unis Venture |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Concentration risk, percentage |  |  |  | 7.00% |  | 4.00%

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