Property, plant and equipment - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2024	Dec. 31, 2023	Jan. 01, 2023
Property, Plant and Equipment [Abstract]
Interest expense capitalized	$ 79	$ 70	$ 49
Depreciation expense, including the amortization of capitalized interest	$ 2,800	$ 2,600	$ 2,400