Supplemental Income Statement Information - Scheduleof Disaggregated Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Disaggregation of Revenue [Line Items]
Total revenues	$ 10,855	$ 10,541	$ 21,219	$ 20,886
Life Sciences Solutions
Disaggregation of Revenue [Line Items]
Total revenues	2,115	1,996	4,069	3,926
Analytical Instruments
Disaggregation of Revenue [Line Items]
Total revenues	1,669	1,727	3,346	3,356
Specialty Diagnostics
Disaggregation of Revenue [Line Items]
Total revenues	1,118	1,100	2,248	2,200
Laboratory Products and Biopharma Services
Disaggregation of Revenue [Line Items]
Total revenues	5,953	5,719	11,556	11,404
Total Reportable Segments
Disaggregation of Revenue [Line Items]
Total revenues	11,356	11,011	22,202	21,817
Total Reportable Segments | Life Sciences Solutions
Disaggregation of Revenue [Line Items]
Total revenues	2,499	2,355	4,840	4,640
Total Reportable Segments | Life Sciences Solutions | Biosciences
Disaggregation of Revenue [Line Items]
Total revenues	1,075	1,059	2,068	2,118
Total Reportable Segments | Life Sciences Solutions | Genetic sciences
Disaggregation of Revenue [Line Items]
Total revenues	679	663	1,356	1,300
Total Reportable Segments | Life Sciences Solutions | BioProduction
Disaggregation of Revenue [Line Items]
Total revenues	745	633	1,416	1,223
Total Reportable Segments | Analytical Instruments
Disaggregation of Revenue [Line Items]
Total revenues	1,728	1,782	3,446	3,469
Total Reportable Segments | Analytical Instruments | Chromatography and mass spectrometry
Disaggregation of Revenue [Line Items]
Total revenues	784	773	1,557	1,562
Total Reportable Segments | Analytical Instruments | Chemical analysis
Disaggregation of Revenue [Line Items]
Total revenues	292	324	578	644
Total Reportable Segments | Analytical Instruments | Electron microscopy
Disaggregation of Revenue [Line Items]
Total revenues	652	684	1,311	1,263
Total Reportable Segments | Specialty Diagnostics
Disaggregation of Revenue [Line Items]
Total revenues	1,134	1,117	2,282	2,227
Total Reportable Segments | Specialty Diagnostics | Clinical diagnostics
Disaggregation of Revenue [Line Items]
Total revenues	276	273	539	536
Total Reportable Segments | Specialty Diagnostics | ImmunoDiagnostics
Disaggregation of Revenue [Line Items]
Total revenues	234	226	451	437
Total Reportable Segments | Specialty Diagnostics | Microbiology
Disaggregation of Revenue [Line Items]
Total revenues	159	158	311	312
Total Reportable Segments | Specialty Diagnostics | Transplant diagnostics
Disaggregation of Revenue [Line Items]
Total revenues	124	111	237	217
Total Reportable Segments | Specialty Diagnostics | Healthcare market channel
Disaggregation of Revenue [Line Items]
Total revenues	407	411	880	849
Total Reportable Segments | Laboratory Products and Biopharma Services
Disaggregation of Revenue [Line Items]
Total revenues	5,995	5,758	11,635	11,480
Total Reportable Segments | Laboratory Products and Biopharma Services | Laboratory products
Disaggregation of Revenue [Line Items]
Total revenues	601	639	1,183	1,264
Total Reportable Segments | Laboratory Products and Biopharma Services | Research and safety market channel
Disaggregation of Revenue [Line Items]
Total revenues	1,883	1,775	3,610	3,486
Total Reportable Segments | Laboratory Products and Biopharma Services | Pharma services
Disaggregation of Revenue [Line Items]
Total revenues	1,794	1,627	3,401	3,205
Total Reportable Segments | Laboratory Products and Biopharma Services | Clinical research
Disaggregation of Revenue [Line Items]
Total revenues	1,955	1,949	3,894	3,982
Elimination of intersegment revenues
Disaggregation of Revenue [Line Items]
Total revenues	(501)	(470)	(983)	(930)
Elimination of intersegment revenues | Specialty Diagnostics
Disaggregation of Revenue [Line Items]
Total revenues	(65)	(62)	(137)	(125)
Elimination of intersegment revenues | Laboratory Products and Biopharma Services
Disaggregation of Revenue [Line Items]
Total revenues	(238)	(233)	(453)	(457)
North America
Disaggregation of Revenue [Line Items]
Total revenues	5,722	5,529	11,235	11,048
Europe
Disaggregation of Revenue [Line Items]
Total revenues	2,830	2,663	5,454	5,282
Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	1,920	1,971	3,811	3,831
Other regions
Disaggregation of Revenue [Line Items]
Total revenues	383	379	720	725
Consumables
Disaggregation of Revenue [Line Items]
Total revenues	4,606	4,363	8,960	8,690
Instruments
Disaggregation of Revenue [Line Items]
Total revenues	1,644	1,800	3,270	3,428
Services
Disaggregation of Revenue [Line Items]
Total revenues	$ 4,605	$ 4,378	$ 8,990	$ 8,768