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Earnings Per Share
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Earnings Per Share Earnings per Share
(In millions except per share amounts)202320222021
Net income attributable to Thermo Fisher Scientific Inc.
$5,995 $6,950 $7,725 
Basic weighted average shares
386 392 394 
Plus effect of: stock options and restricted stock units
2 2 3 
Diluted weighted average shares
388 394 397 
Basic earnings per share
$15.52 $17.75 $19.62 
Diluted earnings per share
$15.45 $17.63 $19.46 
Antidilutive stock options excluded from diluted weighted average shares
2 2 1