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SUPPLEMENTAL BALANCE SHEET DETAILS (Tables) | 6 Months Ended
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Jun. 29, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Accounts Receivable | Accounts Receivable
In millions | June 29, 2025 |  | December 29, 2024
Trade accounts receivable, gross | $ | 709 |  |  | $ | 744 |
Allowance for credit losses | (8) |  |  | (9) |
Total accounts receivable, net | $ | 701 |  |  | $ | 735 |
Schedule of Inventory | Inventory
In millions | June 29, 2025 |  | December 29, 2024
Raw materials | $ | 227 |  |  | $ | 225 |
Work in process | 419 |  |  | 404 |
Finished goods | 47 |  |  | 31 |
Inventory, gross | 693 |  |  | 660 |
Inventory reserve | (118) |  |  | (113) |
Total inventory, net | $ | 575 |  |  | $ | 547 |
Schedule of Accrued Liabilities | Accrued Liabilities
In millions | June 29, 2025 |  | December 29, 2024
Contract liabilities, current portion | $ | 247 |  |  | $ | 260 |
Accrued compensation expenses (1) | 214 |  |  | 252 |
Accrued taxes payable | 75 |  |  | 101 |
Operating lease liabilities, current portion | 79 |  |  | 79 |
Other, including warranties (2) | 147 |  |  | 135 |
Total accrued liabilities | $ | 762 |  |  | $ | 827 |
_____________ (1)Includes employee separation costs related to restructuring activities. (2)See table below for changes in the reserve for product warranties.
Schedule of Changes in Reserve for Product Warranties | Changes in the reserve for product warranties were as follows:
In millions | Q2 2025 |  | Q2 2024 |  | YTD 2025 |  | YTD 2024
Balance at beginning of period | $ | 17 |  |  | $ | 20 |  |  | $ | 18 |  |  | $ | 21 |
Additions charged to cost of product revenue | 6 |  |  | 10 |  |  | 14 |  |  | 22 |
Repairs and replacements | (7) |  |  | (13) |  |  | (16) |  |  | (26) |
Balance at end of period | $ | 16 |  |  | $ | 17 |  |  | $ | 16 |  |  | $ | 17 |
Schedule Of Restructuring and Related Costs | A summary of the pre-tax restructuring charges is as follows:
In millions | Q2 2025 |  | Q2 2024 |  | YTD 2025 |  | YTD 2024 |  | Cumulative charges recorded since inception
Employee separation costs | $ | 8 |  |  | $ | 3 |  |  | $ | 39 |  |  | $ | 7 |  |  | $ | 99 |
Asset impairment charges (1) | — |  |  | — |  |  | — |  |  | 32 |  |  | 146 |
Other costs | — |  |  | 1 |  |  | — |  |  | 1 |  |  | 8 |
Total restructuring charges (2) | $ | 8 |  |  | $ | 4 |  |  | $ | 39 |  |  | $ | 40 |  |  | $ | 253 |
_____________ (1)For YTD 2024, primarily relates to impairment of right-of-use assets and leasehold improvements for our Foster City campus. (2)For Q2 2025, $4 million was recorded in R&D expense, $3 million in SG&A expense, with remainder in cost of revenue. For YTD 2025, $22 million was recorded in SG&A expense, $14 million in R&D expense, with remainder in cost of revenue. For Q2 2024, $4 million was recorded in SG&A expense. For YTD 2024, $39 million was recorded in SG&A expense, with remainder in R&D expense. Restructuring charges for Q2 2024 and YTD 2024 primarily related to Core Illumina segment. A summary of restructuring liability activity during YTD 2025 is as follows:
In millions | Employee Separation Costs (1) |  |  |  | Other Costs |  | Total
Amount recorded in accrued liabilities as of December 29, 2024 | $ | 2 |  |  |  |  | $ | 2 |  |  | $ | 4 |
Additional expense recorded | 39 |  |  |  |  | — |  |  | 39 |
Cash payments | (20) |  |  |  |  | (2) |  |  | (22) |
Adjustments to accrual | (2) |  |  |  |  | — |  |  | (2) |
Amount recorded in accrued liabilities as of June 29, 2025 | $ | 19 |  |  |  |  | $ | — |  |  | $ | 19 |
Estimated costs to still be incurred | $ | (3) |  |  |  |  | $ | — |  |  | $ | (3) |
_____________ (1)It is expected that substantially all of the employee separation related charges will be incurred and paid by the end of Q4 2025.

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-8 + Details
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