Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Revenues
Revenues	$ 10,687	$ 10,970	$ 21,397	$ 22,788
Costs and operating expenses:
Selling, general and administrative expenses	2,145	2,209	4,264	4,486
Research and development expenses	345	365	691	729
Restructuring and other costs	183	24	295	26
Total costs and operating expenses	9,109	8,969	18,256	17,966
Operating income	1,578	2,001	3,141	4,822
Interest income	178	36	324	54
Interest expense	(326)	(148)	(626)	(284)
Other income/(expense)	0	28	(46)	(135)
Income before income taxes	1,430	1,917	2,793	4,457
Provision for income taxes	(52)	(198)	(98)	(499)
Equity in earnings/(losses) of unconsolidated entities	(16)	(51)	(41)	(70)
Net income	1,362	1,668	2,654	3,888
Less: net income/(losses) attributable to noncontrolling interests and redeemable noncontrolling interest	1	4	4	9
Net income attributable to Thermo Fisher Scientific Inc.	$ 1,361	$ 1,664	$ 2,650	$ 3,879
Earnings per share attributable to Thermo Fisher Scientific Inc.
Basic (in dollars per share)	$ 3.53	$ 4.25	$ 6.86	$ 9.90
Diluted (in dollars per share)	$ 3.51	$ 4.22	$ 6.83	$ 9.83
Weighted average shares
Basic (in shares)	386	392	386	392
Diluted (in shares)	388	394	388	394
Product revenues
Revenues
Revenues	$ 6,271	$ 7,003	$ 12,675	$ 15,020
Costs and operating expenses:
Cost of revenues	3,278	3,516	6,615	7,071
Service revenues
Revenues
Revenues	4,416	3,967	8,722	7,768
Costs and operating expenses:
Cost of revenues	$ 3,158	$ 2,855	$ 6,391	$ 5,654