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Intangible assets and goodwill - Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Jan. 01, 2023
Goodwill [Roll Forward] |  |
Goodwill beginning of period | $ 36,047 | $ 25,436
Goodwill, related to acquisitions | 0 | 11,056
Goodwill, related to divestitures | 0 | 0
Currency translation/other | 511 | (445)
Goodwill end of period | 36,558 | 36,047
Innovative Medicine |  |
Goodwill [Roll Forward] |  |
Goodwill beginning of period | 10,184 | 10,580
Goodwill, related to acquisitions | 0 | 0
Goodwill, related to divestitures | 0 | 0
Currency translation/other | 223 | (396)
Goodwill end of period | 10,407 | 10,184
MedTech |  |
Goodwill [Roll Forward] |  |
Goodwill beginning of period | 25,863 | 14,856
Goodwill, related to acquisitions | 0 | 11,056
Goodwill, related to divestitures | 0 | 0
Currency translation/other | 288 | (49)
Goodwill end of period | $ 26,151 | $ 25,863

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