Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

(In millions except per share amounts)	2021		2020		2019
Net income attributable to Thermo Fisher Scientific Inc.	$	7,725	$	6,375	$	3,696
Basic weighted average shares	394		396		400
Plus effect of: stock options and restricted stock units	3		3		3
Diluted weighted average shares	397		399		403
Basic earnings per share	$	19.62	$	16.09	$	9.24
Diluted earnings per share	$	19.46	$	15.96	$	9.17
Antidilutive stock options excluded from diluted weighted average shares	1		1		1