Property, plant and equipment - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022
Property, Plant and Equipment [Abstract]
Interest expense capitalized	$ 70	$ 49	$ 49
Depreciation expense, including the amortization of capitalized interest	$ 2,600	$ 2,400	$ 2,400