Revenue (Disaggregation of Revenue by Geographical Region) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 27, 2026	Mar. 28, 2025
Disaggregation of Revenue [Line Items]
Sales	$ 5,951	$ 5,741
Recurring revenue
Disaggregation of Revenue [Line Items]
Sales	5,031	4,816
Nonrecurring revenue
Disaggregation of Revenue [Line Items]
Sales	920	925
North America
Disaggregation of Revenue [Line Items]
Sales	2,478	2,582
Western Europe
Disaggregation of Revenue [Line Items]
Sales	1,565	1,344
Other developed markets
Disaggregation of Revenue [Line Items]
Sales	284	278
High-growth markets
Disaggregation of Revenue [Line Items]
Sales	1,624	1,537
Operating segments
Disaggregation of Revenue [Line Items]
Sales	5,951	5,741
Operating segments | Biotechnology
Disaggregation of Revenue [Line Items]
Sales	1,797	1,612
Operating segments | Biotechnology | Recurring revenue
Disaggregation of Revenue [Line Items]
Sales	1,642	1,457
Operating segments | Biotechnology | Nonrecurring revenue
Disaggregation of Revenue [Line Items]
Sales	155	155
Operating segments | Biotechnology | North America
Disaggregation of Revenue [Line Items]
Sales	524	543
Operating segments | Biotechnology | Western Europe
Disaggregation of Revenue [Line Items]
Sales	726	566
Operating segments | Biotechnology | Other developed markets
Disaggregation of Revenue [Line Items]
Sales	57	64
Operating segments | Biotechnology | High-growth markets
Disaggregation of Revenue [Line Items]
Sales	490	439
Operating segments | Life Sciences
Disaggregation of Revenue [Line Items]
Sales	1,737	1,680
Operating segments | Life Sciences | Recurring revenue
Disaggregation of Revenue [Line Items]
Sales	1,203	1,136
Operating segments | Life Sciences | Nonrecurring revenue
Disaggregation of Revenue [Line Items]
Sales	534	544
Operating segments | Life Sciences | North America
Disaggregation of Revenue [Line Items]
Sales	689	721
Operating segments | Life Sciences | Western Europe
Disaggregation of Revenue [Line Items]
Sales	408	378
Operating segments | Life Sciences | Other developed markets
Disaggregation of Revenue [Line Items]
Sales	141	123
Operating segments | Life Sciences | High-growth markets
Disaggregation of Revenue [Line Items]
Sales	499	458
Operating segments | Diagnostics
Disaggregation of Revenue [Line Items]
Sales	2,417	2,449
Operating segments | Diagnostics | Recurring revenue
Disaggregation of Revenue [Line Items]
Sales	2,186	2,223
Operating segments | Diagnostics | Nonrecurring revenue
Disaggregation of Revenue [Line Items]
Sales	231	226
Operating segments | Diagnostics | North America
Disaggregation of Revenue [Line Items]
Sales	1,265	1,318
Operating segments | Diagnostics | Western Europe
Disaggregation of Revenue [Line Items]
Sales	431	400
Operating segments | Diagnostics | Other developed markets
Disaggregation of Revenue [Line Items]
Sales	86	91
Operating segments | Diagnostics | High-growth markets
Disaggregation of Revenue [Line Items]
Sales	$ 635	$ 640