Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Comprehensive income
Net income	$ 6,960	$ 7,728	$ 6,377
Currency translation adjustment:
Currency translation adjustment (net of tax provision (benefit) of $173, $231 and $(221))	(822)	373	(118)
Unrealized gains and losses on hedging instruments:
Unrealized losses on hedging instruments (net of tax benefit of $0, $0 and $20)	0	0	(65)
Reclassification adjustment for losses included in net income (net of tax benefit of $1, $17 and $14)	2	56	45
Pension and other postretirement benefit liability adjustments:
Pension and other postretirement benefit liability adjustments arising during the period (net of tax provision (benefit) of $9, $11 and $(1))	38	36	(8)
Amortization of net loss and prior service benefit included in net periodic pension cost (net of tax benefit of $3, $6 and $4)	5	13	18
Total other comprehensive items	(777)	478	(128)
Comprehensive income	6,183	8,206	6,249
Less: comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interest	3	2	2
Comprehensive income attributable to Thermo Fisher Scientific Inc.	$ 6,180	$ 8,204	$ 6,247