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Intangible Assets and Goodwill - Schedule of Intangible Assets and Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018 | Dec. 29, 2019 | Dec. 30, 2018 | Dec. 31, 2017
Finite-Lived And Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Research and Development in Process | $ 890 | $ 1,126 | $ 890 | $ 1,126 | $ 408
Intangible assets with indefinite lives: |  |  |  |  |
Indefinite lived intangible assets |  |  | 11,569 | 9,190 |
Total intangible assets - net |  |  | 47,643 | 47,611 |
Trademarks |  |  |  |  |
Intangible assets with indefinite lives: |  |  |  |  |
Indefinite lived intangible assets |  |  | 6,922 | 6,937 |
Purchased in-process research and development |  |  |  |  |
Intangible assets with indefinite lives: |  |  |  |  |
Indefinite lived intangible assets |  |  | 4,647 | 2,253 |
Patents And Trademarks |  |  |  |  |
Intangible assets with definite lives: |  |  |  |  |
Finite lived intangible assets gross |  |  | 36,634 | 35,194 |
Less accumulated amortization |  |  | 13,154 | 9,784 |
Finite lived intangible assets net |  |  | 23,480 | 25,410 |
Customer relationships and other intangible assets |  |  |  |  |
Intangible assets with definite lives: |  |  |  |  |
Finite lived intangible assets gross |  |  | 22,056 | 21,334 |
Less accumulated amortization |  |  | 9,462 | 8,323 |
Finite lived intangible assets net |  |  | 12,594 | $ 13,011 |
Auris Health | Purchased in-process research and development |  |  |  |  |
Finite-Lived And Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Research and Development in Process |  |  | $ 2,900 |  |
Alios Biopharma Inc | Purchased in-process research and development |  |  |  |  |
Intangible assets with indefinite lives: |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 900 | $ 800 |  |  |

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