Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023
Revenues
Total revenues	$ 10,541	$ 10,687	$ 20,886	$ 21,397
Costs and operating expenses:
Selling, general and administrative expenses	2,111	2,145	4,293	4,264
Research and development expenses	339	345	670	691
Restructuring and other costs	77	183	106	295
Total costs and operating expenses	8,722	9,109	17,404	18,256
Operating income	1,820	1,578	3,483	3,141
Interest income	295	178	574	324
Interest expense	(354)	(326)	(717)	(626)
Other income/(expense)	5	0	14	(46)
Income before income taxes	1,765	1,430	3,354	2,793
Provision for income taxes	(128)	(52)	(408)	(98)
Equity in earnings/(losses) of unconsolidated entities	(84)	(16)	(61)	(41)
Net income	1,553	1,362	2,885	2,654
Less: net income/(losses) attributable to noncontrolling interests and redeemable noncontrolling interest	6	1	9	4
Net income attributable to Thermo Fisher Scientific Inc.	$ 1,548	$ 1,361	$ 2,875	$ 2,650
Earnings per share attributable to Thermo Fisher Scientific Inc.
Basic (in dollars per share)	$ 4.05	$ 3.53	$ 7.53	$ 6.86
Diluted (in dollars per share)	$ 4.04	$ 3.51	$ 7.50	$ 6.83
Weighted average shares
Basic (in shares)	382	386	382	386
Diluted (in shares)	383	388	383	388
Product revenues
Revenues
Total revenues	$ 6,163	$ 6,271	$ 12,118	$ 12,675
Costs and operating expenses:
Cost of revenues	3,080	3,278	6,019	6,615
Service revenues
Revenues
Total revenues	4,378	4,416	8,768	8,722
Costs and operating expenses:
Cost of revenues	$ 3,114	$ 3,158	$ 6,315	$ 6,391