CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Comprehensive income
Net income	$ 6,338	$ 5,955	$ 6,960
Currency translation adjustment:
Currency translation adjustment (net of tax provision (benefit) of $317, $(134) and $173)	525	(69)	(822)
Unrealized gains and losses on hedging instruments:
Reclassification adjustment for losses included in net income (net of tax benefit of $1, $2 and $1)	3	5	2
Pension and other postretirement benefit liability adjustments:
Pension and other postretirement benefit liability adjustments arising during the period (net of tax provision (benefit) of $2, $(22) and $9)	(12)	(69)	38
Amortization of net loss and prior service benefit included in net periodic pension cost (net of tax benefit of $1, $1 and $3)	4	0	5
Total other comprehensive income/(loss)	520	(133)	(777)
Comprehensive income	6,858	5,822	6,183
Less: comprehensive income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interest	(4)	(48)	3
Comprehensive income attributable to Thermo Fisher Scientific Inc.	$ 6,862	$ 5,870	$ 6,180