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Restructuring - Schedule of Restructuring Reserve (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges | $ 489 | $ 275 | $ 209
Operating Segments |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges | 798 |  |
Innovative Medicine |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges |  | 100 | 100
Innovative Medicine | Operating Segments |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges | 479 |  |
Innovative Medicine | Restructuring Charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges | 449 |  |
Innovative Medicine | Costs of Goods and Services Sold |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges | 30 |  |
MedTech |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges |  | $ 300 | $ 300
MedTech | Operating Segments |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges | 319 |  |
MedTech | Restructuring Charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges | 40 |  |
MedTech | Costs of Goods and Services Sold |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges | $ 279 |  |

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