CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 29, 2025	Mar. 30, 2024
Revenues
Total revenues	$ 10,364	$ 10,345
Costs and operating expenses:
Selling, general and administrative expenses	2,078	2,183
Research and development expenses	342	331
Restructuring and other costs	98	29
Total costs and operating expenses	8,648	8,682
Operating income	1,716	1,663
Interest income	203	279
Interest expense	(303)	(363)
Other income/(expense)	3	10
Income before income taxes	1,620	1,589
Benefit from/(provision for) income taxes	(95)	(281)
Equity in earnings/(losses) of unconsolidated entities	(14)	23
Net income	1,511	1,331
Less: net income/(losses) attributable to noncontrolling interests and redeemable noncontrolling interest	4	4
Net income attributable to Thermo Fisher Scientific Inc.	$ 1,507	$ 1,328
Earnings per share attributable to Thermo Fisher Scientific Inc.
Basic (in dollars per share)	$ 3.99	$ 3.47
Diluted (in dollars per share)	$ 3.98	$ 3.46
Weighted average shares
Basic (in shares)	378	382
Diluted (in shares)	379	384
Product revenues
Revenues
Total revenues	$ 5,980	$ 5,955
Costs and operating expenses:
Cost of revenues	3,125	2,939
Service revenues
Revenues
Total revenues	4,384	4,390
Costs and operating expenses:
Cost of revenues	$ 3,004	$ 3,201