Revenue (Revenue Disaggregation by Geographical Region and Revenue Type) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Sales	$ 22,284	$ 17,911	$ 17,049
North America
Disaggregation of Revenue [Line Items]
Sales	9,011	7,012	6,470
Western Europe
Disaggregation of Revenue [Line Items]
Sales	5,323	4,057	4,061
Other developed markets
Disaggregation of Revenue [Line Items]
Sales	1,299	1,112	1,075
High-growth markets
Disaggregation of Revenue [Line Items]
Sales	6,651	5,730	5,443
Recurring
Disaggregation of Revenue [Line Items]
Sales	15,978	12,307	11,684
Nonrecurring
Disaggregation of Revenue [Line Items]
Sales	6,306	5,604	5,365
Operating segments | Life Sciences
Disaggregation of Revenue [Line Items]
Sales	10,576	6,951	6,471
Operating segments | Life Sciences | North America
Disaggregation of Revenue [Line Items]
Sales	3,919	2,596	2,295
Operating segments | Life Sciences | Western Europe
Disaggregation of Revenue [Line Items]
Sales	2,939	1,876	1,847
Operating segments | Life Sciences | Other developed markets
Disaggregation of Revenue [Line Items]
Sales	754	585	570
Operating segments | Life Sciences | High-growth markets
Disaggregation of Revenue [Line Items]
Sales	2,964	1,894	1,759
Operating segments | Life Sciences | Recurring
Disaggregation of Revenue [Line Items]
Sales	7,400	4,411	4,132
Operating segments | Life Sciences | Nonrecurring
Disaggregation of Revenue [Line Items]
Sales	3,176	2,540	2,339
Operating segments | Diagnostics
Disaggregation of Revenue [Line Items]
Sales	7,403	6,561	6,258
Operating segments | Diagnostics | North America
Disaggregation of Revenue [Line Items]
Sales	3,182	2,531	2,404
Operating segments | Diagnostics | Western Europe
Disaggregation of Revenue [Line Items]
Sales	1,375	1,132	1,155
Operating segments | Diagnostics | Other developed markets
Disaggregation of Revenue [Line Items]
Sales	423	402	379
Operating segments | Diagnostics | High-growth markets
Disaggregation of Revenue [Line Items]
Sales	2,423	2,496	2,320
Operating segments | Diagnostics | Recurring
Disaggregation of Revenue [Line Items]
Sales	6,143	5,524	5,272
Operating segments | Diagnostics | Nonrecurring
Disaggregation of Revenue [Line Items]
Sales	1,260	1,037	986
Operating segments | Environmental & Applied Solutions
Disaggregation of Revenue [Line Items]
Sales	4,305	4,399	4,320
Operating segments | Environmental & Applied Solutions | North America
Disaggregation of Revenue [Line Items]
Sales	1,910	1,885	1,771
Operating segments | Environmental & Applied Solutions | Western Europe
Disaggregation of Revenue [Line Items]
Sales	1,009	1,049	1,059
Operating segments | Environmental & Applied Solutions | Other developed markets
Disaggregation of Revenue [Line Items]
Sales	122	125	126
Operating segments | Environmental & Applied Solutions | High-growth markets
Disaggregation of Revenue [Line Items]
Sales	1,264	1,340	1,364
Operating segments | Environmental & Applied Solutions | Recurring
Disaggregation of Revenue [Line Items]
Sales	2,435	2,372	2,280
Operating segments | Environmental & Applied Solutions | Nonrecurring
Disaggregation of Revenue [Line Items]
Sales	$ 1,870	$ 2,027	$ 2,040