Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 76,804	$ 74,023	$ 63,278
Net change	(4,741)	91	2,184
Ending Balance	68,774	76,804	74,023
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(11,813)	(10,017)	(8,938)
Net change	(3,221)	(1,796)	(1,079)
Kenvue Separation/IPO	4,885
Ending Balance	(10,149)	(11,813)	(10,017)
Gain/ (Loss) On Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(27)	(3)	1
Net change	26	(24)	(4)
Ending Balance	(1)	(27)	(3)
Employee Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(897)	(2,702)	(6,957)
Net change	(1,399)	1,805	4,255
Kenvue Separation/IPO	296
Ending Balance	(2,000)	(897)	(2,702)
Gain/ (Loss) On Derivatives & Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(230)	(336)	652
Net change	(147)	106	(988)
Ending Balance	(377)	(230)	(336)
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(12,967)	(13,058)	(15,242)
Net change	(4,741)	91	2,184
Kenvue Separation/IPO	5,181
Ending Balance	$ (12,527)	$ (12,967)	$ (13,058)