CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Revenues
Total revenues	$ 10,855	$ 10,541	$ 21,219	$ 20,886
Costs and operating expenses:
Selling, general and administrative expenses	2,140	2,111	4,218	4,293
Research and development expenses	352	339	695	670
Restructuring and other costs	82	77	180	106
Total costs and operating expenses	9,021	8,722	17,668	17,404
Operating income	1,834	1,820	3,551	3,483
Interest income	297	295	501	574
Interest expense	(404)	(354)	(707)	(717)
Other income/(expense)	(19)	5	(16)	14
Income before income taxes	1,709	1,765	3,329	3,354
Benefit from/(provision for) income taxes	(92)	(128)	(187)	(408)
Equity in earnings/(losses) of unconsolidated entities	2	(84)	(12)	(61)
Net income	1,618	1,553	3,130	2,885
Less: net income/(losses) attributable to noncontrolling interests and redeemable noncontrolling interest	2	6	6	9
Net income attributable to Thermo Fisher Scientific Inc.	$ 1,617	$ 1,548	$ 3,124	$ 2,875
Earnings per share attributable to Thermo Fisher Scientific Inc.
Basic (in dollars per share)	$ 4.28	$ 4.05	$ 8.27	$ 7.53
Diluted (in dollars per share)	$ 4.28	$ 4.04	$ 8.26	$ 7.50
Weighted average shares
Basic (in shares)	378	382	378	382
Diluted (in shares)	378	383	378	383
Product revenues
Revenues
Total revenues	$ 6,249	$ 6,163	$ 12,229	$ 12,118
Costs and operating expenses:
Cost of revenues	3,239	3,080	6,364	6,019
Service revenues
Revenues
Total revenues	4,605	4,378	8,990	8,768
Costs and operating expenses:
Cost of revenues	$ 3,207	$ 3,114	$ 6,212	$ 6,315