Goodwill and Other Intangible Assets (Narrative) (Details)		3 Months Ended			9 Months Ended
	Jun. 28, 2025 USD ($)	Sep. 26, 2025 USD ($) reportingUnit	Jun. 27, 2025 USD ($)	Sep. 27, 2024 USD ($)	Sep. 26, 2025 USD ($)	Sep. 27, 2024 USD ($)	Dec. 31, 2024 USD ($)
Property, Plant and Equipment [Line Items]
Impairment charges		$ 101,000,000		$ 222,000,000	$ 548,000,000	$ 222,000,000
Goodwill impairment	$ 0
Goodwill		$ 42,948,000,000			42,948,000,000		$ 40,497,000,000
Reporting Unit, Change In Businesses
Property, Plant and Equipment [Line Items]
Goodwill reporting units | reportingUnit		2
Reporting Units-Total
Property, Plant and Equipment [Line Items]
Goodwill reporting units | reportingUnit		5
Minimum
Property, Plant and Equipment [Line Items]
Goodwill	1,200,000,000
Maximum
Property, Plant and Equipment [Line Items]
Goodwill	$ 23,100,000,000
Life Sciences
Property, Plant and Equipment [Line Items]
Impairment charges			$ 0	0
Goodwill impairment			0	0
Life Sciences | Trade Names
Property, Plant and Equipment [Line Items]
Finite-lived intangible assets, net			$ 76,000,000
Finite-lived intangible asset, useful life			8 years
Life Sciences | Trade Names
Property, Plant and Equipment [Line Items]
Impairment charges				222,000,000	432,000,000	222,000,000
Impairment charges, after tax				$ 169,000,000	328,000,000	$ 169,000,000
Biotechnology and Diagnostics | Technology-Based Intangible Assets
Property, Plant and Equipment [Line Items]
Impairment charges		$ 101,000,000			101,000,000
Biotechnology | Facility
Property, Plant and Equipment [Line Items]
Impairment charges					$ 15,000,000