Intangible assets and goodwill - Goodwill By Segment (Details) $ in Millions	6 Months Ended
Jun. 28, 2026 USD ($)
Goodwill [Roll Forward]
Goodwill Beginning of Period	$ 48,772
Goodwill, related to acquisitions	3
Goodwill, related to divestitures	0
Currency translation/Other	(296)
Goodwill End of Period	48,479
Innovative Medicine
Goodwill [Roll Forward]
Goodwill Beginning of Period	14,967
Goodwill, related to acquisitions	0
Goodwill, related to divestitures	0
Currency translation/Other	(212)
Goodwill End of Period	14,755
MedTech
Goodwill [Roll Forward]
Goodwill Beginning of Period	33,805
Goodwill, related to acquisitions	3
Goodwill, related to divestitures	0
Currency translation/Other	(84)
Goodwill End of Period	$ 33,724

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details