v3.26.1
Supplemental Income Statement Information - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 27, 2026
Jun. 28, 2025
Jun. 27, 2026
Jun. 28, 2025
Supplemental Income Statement Elements [Abstract]        
Net income attributable to Thermo Fisher Scientific Inc. $ 1,736 $ 1,617 $ 3,387 $ 3,124
Basic weighted average shares (in shares) 371 378 372 378
Plus effect of: stock options and restricted stock units (in shares) 0 0 0 1
Diluted weighted average shares (in shares) 371 378 372 378
Basic earnings per share (in dollars per share) $ 4.68 $ 4.28 $ 9.11 $ 8.27
Diluted earnings per share (in dollars per share) $ 4.68 $ 4.28 $ 9.10 $ 8.26
Antidilutive stock options excluded from diluted weighted average shares (in shares) 4 4 3 3