Segment Information (Segment Data) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 27, 2025	Jun. 28, 2024	Jun. 27, 2025	Jun. 28, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Sales	$ 5,936,000,000	$ 5,743,000,000	$ 11,677,000,000	$ 11,539,000,000
Less:
Depreciation	(185,000,000)	(178,000,000)	(366,000,000)	(357,000,000)
Amortization of intangible assets	(426,000,000)	(402,000,000)	(836,000,000)	(809,000,000)
Impairments	(432,000,000)		(447,000,000)	0
Other segment expenses	(4,133,000,000)	(3,995,000,000)	(7,994,000,000)	(7,893,000,000)
Operating profit	760,000,000	1,168,000,000	2,034,000,000	2,480,000,000
Identifiable assets	81,620,000,000		81,620,000,000		$ 77,542,000,000
Capital expenditures	248,000,000	287,000,000	493,000,000	578,000,000
Other
Segment Reporting Information [Line Items]
Sales	0	0	0	0
Less:
Depreciation	(2,000,000)	(2,000,000)	(4,000,000)	(4,000,000)
Amortization of intangible assets	0	0	0	0
Impairments	0		0
Other segment expenses	(84,000,000)	(81,000,000)	(168,000,000)	(157,000,000)
Operating profit	(86,000,000)	(83,000,000)	(172,000,000)	(161,000,000)
Identifiable assets	6,124,000,000		6,124,000,000		5,522,000,000
Capital expenditures	2,000,000	0	3,000,000	2,000,000
Biotechnology | Operating segments
Segment Reporting Information [Line Items]
Sales	1,850,000,000	1,713,000,000	3,462,000,000	3,237,000,000
Less:
Depreciation	(38,000,000)	(35,000,000)	(72,000,000)	(77,000,000)
Amortization of intangible assets	(228,000,000)	(214,000,000)	(441,000,000)	(432,000,000)
Impairments	0		(15,000,000)
Other segment expenses	(1,053,000,000)	(1,002,000,000)	(1,962,000,000)	(1,941,000,000)
Operating profit	531,000,000	462,000,000	972,000,000	787,000,000
Identifiable assets	37,562,000,000		37,562,000,000		34,605,000,000
Capital expenditures	80,000,000	111,000,000	161,000,000	213,000,000
Life Sciences
Less:
Impairments	0
Life Sciences | Operating segments
Segment Reporting Information [Line Items]
Sales	1,777,000,000	1,770,000,000	3,457,000,000	3,515,000,000
Less:
Depreciation	(45,000,000)	(41,000,000)	(90,000,000)	(79,000,000)
Amortization of intangible assets	(150,000,000)	(140,000,000)	(299,000,000)	(281,000,000)
Impairments	(432,000,000)		(432,000,000)
Other segment expenses	(1,389,000,000)	(1,356,000,000)	(2,674,000,000)	(2,687,000,000)
Operating profit	(239,000,000)	233,000,000	(38,000,000)	468,000,000
Identifiable assets	23,397,000,000		23,397,000,000		23,211,000,000
Capital expenditures	41,000,000	50,000,000	89,000,000	110,000,000
Diagnostics | Operating segments
Segment Reporting Information [Line Items]
Sales	2,309,000,000	2,260,000,000	4,758,000,000	4,787,000,000
Less:
Depreciation	(100,000,000)	(100,000,000)	(200,000,000)	(197,000,000)
Amortization of intangible assets	(48,000,000)	(48,000,000)	(96,000,000)	(96,000,000)
Impairments	0		0
Other segment expenses	(1,607,000,000)	(1,556,000,000)	(3,190,000,000)	(3,108,000,000)
Operating profit	554,000,000	556,000,000	1,272,000,000	1,386,000,000
Identifiable assets	14,537,000,000		14,537,000,000		$ 14,204,000,000
Capital expenditures	$ 125,000,000	$ 126,000,000	$ 240,000,000	$ 253,000,000