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SUPPLEMENTAL BALANCE SHEET DETAILS - Narrative - Impairment of Goodwill and Intangible Assets (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 24, 2024 USD ($) | Sep. 29, 2024 USD ($) | Jun. 30, 2024 USD ($) | Oct. 01, 2023 USD ($) | Sep. 29, 2024 USD ($) reporting_unit | Oct. 01, 2023 USD ($) | Dec. 31, 2023 USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  |  | 2 |  |
Goodwill and intangible impairment |  |  |  |  | $ 1,466 |  |
Goodwill |  | $ 1,113 |  |  | 1,113 |  | $ 2,545
Effect of 300 point increase in discount rate on impairment loss |  |  | $ 20 |  |  |  |
Amortization of intangible assets |  | 17 |  | $ 49 | $ 113 | $ 148 |
Developed technologies | Fluent Bio Sciences |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Finite-lived intangible assets acquired |  | 42 |  |  |  |  |
Useful life (in years) |  |  |  |  | 7 years |  |
Customer relationships | Fluent Bio Sciences |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Finite-lived intangible assets acquired |  | 2 |  |  |  |  |
Useful life (in years) |  |  |  |  | 11 years |  |
In-process research and development (IPR&D) |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill fair value recorded impairment |  |  |  |  |  |  | 115
Spinoff | GRAIL |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Amount of continuing cash flows after disposal | $ 974 |  |  |  |  |  |
GRAIL net assets | $ 2,738 |  |  |  |  |  |
Minimum | Spinoff | GRAIL |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
GRAIL net assets |  |  | 400 |  |  |  |
Maximum | Spinoff | GRAIL |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
GRAIL net assets |  |  | 770 |  |  |  |
GRAIL |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Amount that exceeds carrying value |  | $ 580 |  |  | $ 580 |  |
Goodwill and intangible impairment |  |  | 1,466 | 712 |  |  |
Goodwill |  |  |  | 3,600 |  | $ 3,600 |
Effect of 50 point increase in discount rate on impairment loss |  |  |  | 200 |  |  |
Effect of 100 point increase in discount rate on impairment loss |  |  |  | $ 350 |  |  |
GRAIL | In-process research and development (IPR&D) |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill fair value recorded impairment |  |  | $ 420 |  |  |  |
GRAIL | Minimum |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 3,000
GRAIL | Maximum |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 4,000
GRAIL | Measurement Input, Expected Term | Valuation Technique, Discounted Cash Flow |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment, measurement input |  | 2 |  |  |  |  |
GRAIL | Measurement Input, Expected Term | Valuation Technique, Discounted Cash Flow | In-process research and development (IPR&D) |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Intangible assets, impairment, measurement input |  |  | 15 |  |  |  |
GRAIL | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment, measurement input |  |  |  | 0.240 |  |  |
GRAIL | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow | In-process research and development (IPR&D) |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Intangible assets, impairment, measurement input |  |  | 0.465 |  |  |  |
GRAIL | Measurement Input, Cash Flow Period | Valuation Technique, Discounted Cash Flow |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment, measurement input |  |  |  | 15 |  |  |

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