CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 28, 2026	Mar. 29, 2025
Revenues
Total revenues	$ 11,005	$ 10,364
Costs and operating expenses:
Selling, general and administrative expenses	2,181	2,078
Research and development expenses	336	342
Restructuring and other costs	49	98
Total costs and operating expenses	9,142	8,648
Operating income	1,863	1,716
Interest income	233	203
Interest expense	(354)	(303)
Other income/(expense)	(9)	3
Income before income taxes	1,734	1,620
Benefit from/(provision for) income taxes	(70)	(95)
Equity in earnings/(losses) of unconsolidated entities	(8)	(14)
Net income	1,656	1,511
Less: net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interest	5	4
Net income attributable to Thermo Fisher Scientific Inc.	$ 1,651	$ 1,507
Earnings per share attributable to Thermo Fisher Scientific Inc.
Basic (in dollars per share)	$ 4.44	$ 3.99
Diluted (in dollars per share)	$ 4.43	$ 3.98
Weighted average shares
Basic (in shares)	372	378
Diluted (in shares)	373	379
Product revenues
Revenues
Total revenues	$ 6,277	$ 5,980
Costs and operating expenses:
Cost of revenues	3,261	3,125
Service revenues
Revenues
Total revenues	4,728	4,384
Costs and operating expenses:
Cost of revenues	$ 3,314	$ 3,004