Income taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2024	Dec. 31, 2023	Jan. 01, 2023
Currently payable:
U.S. taxes	$ 2,200	$ 2,705	$ 2,274
International taxes	2,604	3,090	2,295
Total currently payable	4,804	5,795	4,569
Deferred:
U.S. taxes	(2,539)	(3,440)	(1,990)
International taxes	356	(619)	410
Total deferred	(2,183)	(4,059)	(1,580)
Provision for taxes on income	$ 2,621	$ 1,736	$ 2,989