Supplemental Income Statement Information - Scheduleof Disaggregated Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2026	Mar. 29, 2025
Disaggregation of Revenue [Line Items]
Total revenues	$ 11,005	$ 10,364
Life Sciences Solutions
Disaggregation of Revenue [Line Items]
Total revenues	2,219	1,954
Analytical Instruments
Disaggregation of Revenue [Line Items]
Total revenues	1,667	1,677
Specialty Diagnostics
Disaggregation of Revenue [Line Items]
Total revenues	1,124	1,130
Specialty Diagnostics | Intersubsegment Eliminations
Disaggregation of Revenue [Line Items]
Total revenues	(71)	(72)
Laboratory Products and Biopharma Services
Disaggregation of Revenue [Line Items]
Total revenues	5,995	5,603
Laboratory Products and Biopharma Services | Intersubsegment Eliminations
Disaggregation of Revenue [Line Items]
Total revenues	(228)	(214)
Total Reportable Segments
Disaggregation of Revenue [Line Items]
Total revenues	11,529	10,846
Total Reportable Segments | Life Sciences Solutions
Disaggregation of Revenue [Line Items]
Total revenues	2,636	2,341
Total Reportable Segments | Life Sciences Solutions | Biosciences
Disaggregation of Revenue [Line Items]
Total revenues	981	993
Total Reportable Segments | Life Sciences Solutions | Genetic sciences
Disaggregation of Revenue [Line Items]
Total revenues	655	677
Total Reportable Segments | Life Sciences Solutions | BioProduction
Disaggregation of Revenue [Line Items]
Total revenues	893	671
Total Reportable Segments | Life Sciences Solutions | Other
Disaggregation of Revenue [Line Items]
Total revenues	107	0
Total Reportable Segments | Analytical Instruments
Disaggregation of Revenue [Line Items]
Total revenues	1,716	1,718
Total Reportable Segments | Analytical Instruments | Chromatography and mass spectrometry
Disaggregation of Revenue [Line Items]
Total revenues	798	773
Total Reportable Segments | Analytical Instruments | Chemical analysis
Disaggregation of Revenue [Line Items]
Total revenues	285	286
Total Reportable Segments | Analytical Instruments | Electron microscopy
Disaggregation of Revenue [Line Items]
Total revenues	633	659
Total Reportable Segments | Specialty Diagnostics
Disaggregation of Revenue [Line Items]
Total revenues	1,142	1,148
Total Reportable Segments | Specialty Diagnostics | Clinical diagnostics
Disaggregation of Revenue [Line Items]
Total revenues	271	263
Total Reportable Segments | Specialty Diagnostics | ImmunoDiagnostics
Disaggregation of Revenue [Line Items]
Total revenues	230	217
Total Reportable Segments | Specialty Diagnostics | Microbiology
Disaggregation of Revenue [Line Items]
Total revenues	160	152
Total Reportable Segments | Specialty Diagnostics | Transplant diagnostics
Disaggregation of Revenue [Line Items]
Total revenues	121	113
Total Reportable Segments | Specialty Diagnostics | Healthcare market channel
Disaggregation of Revenue [Line Items]
Total revenues	430	474
Total Reportable Segments | Laboratory Products and Biopharma Services
Disaggregation of Revenue [Line Items]
Total revenues	6,036	5,640
Total Reportable Segments | Laboratory Products and Biopharma Services | Laboratory products
Disaggregation of Revenue [Line Items]
Total revenues	569	582
Total Reportable Segments | Laboratory Products and Biopharma Services | Research and safety market channel
Disaggregation of Revenue [Line Items]
Total revenues	1,827	1,727
Total Reportable Segments | Laboratory Products and Biopharma Services | Pharma services
Disaggregation of Revenue [Line Items]
Total revenues	1,741	1,607
Total Reportable Segments | Laboratory Products and Biopharma Services | Clinical research
Disaggregation of Revenue [Line Items]
Total revenues	2,128	1,939
Elimination of intersegment revenues
Disaggregation of Revenue [Line Items]
Total revenues	(524)	(482)
North America
Disaggregation of Revenue [Line Items]
Total revenues	5,705	5,513
Europe
Disaggregation of Revenue [Line Items]
Total revenues	2,957	2,624
Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	1,970	1,891
Other regions
Disaggregation of Revenue [Line Items]
Total revenues	372	337
Consumables
Disaggregation of Revenue [Line Items]
Total revenues	4,722	4,354
Instruments
Disaggregation of Revenue [Line Items]
Total revenues	1,555	1,626
Services
Disaggregation of Revenue [Line Items]
Total revenues	$ 4,728	$ 4,384