Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Revenues
Revenues	$ 10,574	$ 10,677	$ 31,971	$ 33,465
Costs and operating expenses:
Selling, general and administrative expenses	2,049	2,208	6,313	6,694
Research and development expenses	319	351	1,010	1,080
Restructuring and other costs	84	33	379	59
Total costs and operating expenses	8,710	8,967	26,966	26,933
Operating income	1,864	1,710	5,005	6,532
Interest income	246	68	570	122
Interest expense	(359)	(173)	(985)	(457)
Other income/(expense)	14	(4)	(32)	(139)
Income before income taxes	1,765	1,601	4,558	6,058
Provision for income taxes	(53)	(31)	(151)	(530)
Equity in earnings/(losses) of unconsolidated entities	(17)	(72)	(58)	(142)
Net income	1,695	1,498	4,349	5,386
Less: net income/(losses) attributable to noncontrolling interests and redeemable noncontrolling interest	(20)	3	(16)	12
Net income attributable to Thermo Fisher Scientific Inc.	$ 1,715	$ 1,495	$ 4,365	$ 5,374
Earnings per share attributable to Thermo Fisher Scientific Inc.
Basic (in dollars per share)	$ 4.44	$ 3.82	$ 11.31	$ 13.72
Diluted (in dollars per share)	$ 4.42	$ 3.79	$ 11.25	$ 13.62
Weighted average shares
Basic (in shares)	386	392	386	392
Diluted (in shares)	388	395	388	395
Product revenues
Revenues
Revenues	$ 6,157	$ 6,583	$ 18,832	$ 21,603
Costs and operating expenses:
Cost of revenues	3,214	3,494	9,829	10,565
Service revenues
Revenues
Revenues	4,417	4,094	13,139	11,862
Costs and operating expenses:
Cost of revenues	$ 3,044	$ 2,881	$ 9,435	$ 8,535