Consolidated Statement of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Revenues
Revenues	$ 10,970	$ 9,273	$ 22,788	$ 19,179
Costs and operating expenses:
Selling, general and administrative expenses	2,209	1,899	4,486	3,725
Research and development expenses	365	343	729	663
Restructuring and other costs	24	119	26	133
Total costs and operating expenses	8,969	7,110	17,966	13,967
Operating income	2,001	2,163	4,822	5,212
Interest income	36	11	54	23
Interest expense	(148)	(122)	(284)	(247)
Other income/(expense)	28	(3)	(135)	(186)
Income before income taxes	1,917	2,049	4,457	4,802
Provision for income taxes	(198)	(219)	(499)	(635)
Equity in earnings/(losses) of unconsolidated entities	(51)	(1)	(70)	(1)
Net income	1,668	1,829	3,888	4,166
Less: net income attributable to noncontrolling interests and redeemable noncontrolling interest	4	1	9	1
Net income	$ 1,664	$ 1,828	$ 3,879	$ 4,165
Earnings per share attributable to Thermo Fisher Scientific Inc.
Basic (in dollars per share)	$ 4.25	$ 4.65	$ 9.90	$ 10.58
Diluted (in dollars per share)	$ 4.22	$ 4.61	$ 9.83	$ 10.50
Weighted average shares
Basic (in shares)	392	393	392	394
Diluted (in shares)	394	396	394	397
Product [Member]
Revenues
Revenues	$ 7,003	$ 7,214	$ 15,020	$ 15,070
Costs and operating expenses:
Cost of revenues	3,516	3,352	7,071	6,679
Service [Member]
Revenues
Revenues	3,967	2,059	7,768	4,109
Costs and operating expenses:
Cost of revenues	$ 2,855	$ 1,397	$ 5,654	$ 2,767