Goodwill and Other Intangible Assets (Rollforward of Goodwill) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 29, 2023	Dec. 31, 2024
Goodwill [Roll Forward]
Balance at beginning of year	$ 37,276	$ 41,608
Attributable to acquisitions	3,851	305
Adjustments due to finalization of purchase price allocations	7	(23)
Foreign currency translation and other	474	(1,393)
Balance at end of year		40,497
Operating segments | Biotechnology
Goodwill [Roll Forward]
Balance at beginning of year	22,087	22,477
Attributable to acquisitions	0	0
Adjustments due to finalization of purchase price allocations	2	0
Foreign currency translation and other	388	(1,040)
Balance at end of year		21,437
Operating segments | Life Sciences
Goodwill [Roll Forward]
Balance at beginning of year	8,314	12,221
Attributable to acquisitions	3,851	305
Adjustments due to finalization of purchase price allocations	5	(23)
Foreign currency translation and other	51	(198)
Balance at end of year		12,305
Operating segments | Diagnostics
Goodwill [Roll Forward]
Balance at beginning of year	6,875	6,910
Attributable to acquisitions	0	0
Adjustments due to finalization of purchase price allocations	0	0
Foreign currency translation and other	$ 35	(155)
Balance at end of year		$ 6,755