Earnings per Share (Tables)

6 Months Ended

Jul. 01, 2023

Earnings Per Share [Abstract]

Schedule of Earnings Per Share

	Three months ended				Six months ended
	July 1,		July 2,		July 1,		July 2,
(In millions except per share amounts)	2023		2022		2023		2022
Net income attributable to Thermo Fisher Scientific Inc.	$	1,361	$	1,664	$	2,650	$	3,879
Basic weighted average shares	386		392		386		392
Plus effect of: stock options and restricted stock units	2		2		2		2
Diluted weighted average shares	388		394		388		394
Basic earnings per share	$	3.53	$	4.25	$	6.86	$	9.90
Diluted earnings per share	$	3.51	$	4.22	$	6.83	$	9.83
Antidilutive stock options excluded from diluted weighted average shares	2		2		2		2