Goodwill and Other Intangible Assets (Narrative) (Details)		3 Months Ended			12 Months Ended
	Jun. 28, 2025 USD ($)	Sep. 26, 2025 reporting_unit	Jun. 27, 2025 USD ($)	Sep. 27, 2024 USD ($)	Dec. 31, 2025 USD ($) reporting_unit	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Goodwill [Line Items]
Reporting units | reporting_unit					5
Goodwill					$ 43,151,000,000	$ 40,497,000,000	$ 41,608,000,000
Goodwill impairment loss	$ 0				0	0	0
Impairment charges					562,000,000	265,000,000	77,000,000
Amortization of intangible assets					1,697,000,000	1,631,000,000	1,491,000,000
Estimated amortization expense, 2026					1,700,000,000
Estimated amortization expense, 2027					1,600,000,000
Estimated amortization expense, 2028					1,600,000,000
Estimated amortization expense, 2029					1,600,000,000
Estimated amortization expense, 2030					1,400,000,000
Cost of Sales
Goodwill [Line Items]
Impairment charges					29,000,000		14,000,000
Life Sciences
Goodwill [Line Items]
Goodwill impairment loss			$ 0	$ 0
Impairment charges			0	$ 0
Life Sciences | Trade Names
Goodwill [Line Items]
Finite-lived intangible assets, net			$ 76,000,000
Finite-lived intangible asset, useful life			8 years
Life Sciences | Trade Names
Goodwill [Line Items]
Impairment charges					432,000,000	222,000,000
Impairment charges, after tax					328,000,000	169,000,000
Life Sciences, Biotechnology and Diagnostics Segment
Goodwill [Line Items]
Impairment charges					130,000,000
Diagnostics | Trade Names
Goodwill [Line Items]
Impairment charges						$ 43,000,000
Biotechnology and Diagnostics Segment | Selling, General and Administrative Expenses
Goodwill [Line Items]
Impairment charges							$ 77,000,000
Minimum
Goodwill [Line Items]
Goodwill	1,200,000,000				1,200,000,000
Maximum
Goodwill [Line Items]
Goodwill	$ 23,100,000,000				$ 23,100,000,000
Reporting Unit, Change In Busines
Goodwill [Line Items]
Reporting units | reporting_unit		2
Reporting Units-Total
Goodwill [Line Items]
Reporting units | reporting_unit		5