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Intangible assets and goodwill - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill beginning of period	$ 36,558	$ 36,047
Goodwill, related to acquisitions	8,209	0
Goodwill, related to divestitures	(56)	0
Currency translation/other	(511)	511
Goodwill end of period	44,200	36,558
Innovative Medicine
Goodwill [Roll Forward]
Goodwill beginning of period	10,407	10,184
Goodwill, related to acquisitions	640	0
Goodwill, related to divestitures	0	0
Currency translation/other	(355)	223
Goodwill end of period	10,692	10,407
MedTech
Goodwill [Roll Forward]
Goodwill beginning of period	26,151	25,863
Goodwill, related to acquisitions	7,569	0
Goodwill, related to divestitures	(56)	0
Currency translation/other	(156)	288
Goodwill end of period	$ 33,508	$ 26,151

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