Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Comprehensive income
Net income	$ 1,362	$ 1,668	$ 2,654	$ 3,888
Currency translation adjustment:
Currency translation adjustment (net of tax provision (benefit) of $0, $173, $(36) and $262)	125	(386)	169	(416)
Unrealized gains and losses on hedging instruments:
Reclassification adjustment for losses included in net income (net of tax benefit of $0, $1, $1 and $1)	1	0	4	1
Pension and other postretirement benefit liability adjustments:
Pension and other postretirement benefit liability adjustments arising during the period (net of tax (provision) benefit of $1, $(2), $0 and $(3))	(1)	6	0	9
Amortization of net loss included in net periodic pension cost (net of tax benefit of $0, $1, $0 and $2)	(2)	2	(2)	4
Total other comprehensive income/(loss)	123	(378)	171	(402)
Comprehensive income	1,485	1,290	2,825	3,486
Less: comprehensive income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interest	(6)	7	0	2
Comprehensive income attributable to Thermo Fisher Scientific Inc.	$ 1,491	$ 1,283	$ 2,825	$ 3,484