Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Comprehensive income
Net income	$ 7,728	$ 6,377	$ 3,698
Currency translation adjustment:
Currency translation adjustment (net of tax provision (benefit) of $231, $(221) and $25)	373	(118)	(106)
Reclassification adjustment for losses included in net income	0	0	30
Unrealized gains and losses on hedging instruments:
Unrealized losses on hedging instruments (net of tax benefit of $0, $20 and $12)	0	(65)	(38)
Reclassification adjustment for losses included in net income (net of tax benefit of $17, $14 and $6)	56	45	19
Pension and other postretirement benefit liability adjustments:
Pension and other postretirement benefit liability adjustments arising during the period (net of tax provision (benefit) of $11, $(1) and $(31))	36	(8)	(93)
Amortization of net loss and prior service benefit included in net periodic pension cost (net of tax benefit of $6, $4 and $2)	13	18	8
Total other comprehensive items	478	(128)	(180)
Comprehensive income	8,206	6,249	3,518
Less: comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interest	2	2	3
Comprehensive income attributable to Thermo Fisher Scientific Inc.	$ 8,204	$ 6,247	$ 3,515