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Intangible assets and goodwil - Schedule of Intangible Assets and Goodwill (Details) - USD ($) $ in Millions | Dec. 29, 2024 | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 22, 2022
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Intangible assets with indefinite lives: |  |  |  |
Indefinite lived intangible assets | $ 12,281 |  | $ 10,929 |
Total intangible assets - net | 37,618 |  | 34,175 |
Intangible assets useful life |  |  |  | 14 years
Trademarks |  |  |  |
Intangible assets with indefinite lives: |  |  |  |
Indefinite lived intangible assets | 0 |  | 1,714 |
Purchased in-process research and development |  |  |  |
Intangible assets with indefinite lives: |  |  |  |
Indefinite lived intangible assets | 12,281 |  | 9,215 |
Patents And Trademarks |  |  |  |
Intangible assets with definite lives: |  |  |  |
Finite lived intangible assets gross | 44,695 |  | 40,417 |
Less accumulated amortization | (26,124) |  | (24,808) |
Finite lived intangible assets net | $ 18,571 |  | 15,609 |
Intangible assets with indefinite lives: |  |  |  |
Intangible assets useful life | 12 years |  |  |
Customer relationships and other intangible assets |  |  |  |
Intangible assets with definite lives: |  |  |  |
Finite lived intangible assets gross | $ 20,310 |  | 20,322 |
Less accumulated amortization | (13,544) |  | (12,685) |
Finite lived intangible assets net | $ 6,766 |  | $ 7,637 |
Intangible assets with indefinite lives: |  |  |  |
Intangible assets useful life | 18 years |  |  |
Trademarks |  |  |  |
Intangible assets with definite lives: |  |  |  |
Finite lived intangible assets gross |  | $ 1,700 |  |
Intangible assets with indefinite lives: |  |  |  |
Intangible assets useful life |  | 25 years |  |

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