Income taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022
Currently payable:
U.S. taxes	$ 2,705	$ 2,274	$ 1,338
International taxes	3,090	2,295	2,069
Total currently payable	5,795	4,569	3,407
Deferred:
U.S. taxes	(3,440)	(1,990)	565
International taxes	(619)	410	(2,595)
Total deferred	(4,059)	(1,580)	(2,030)
Provision for taxes on income	$ 1,736	$ 2,989	$ 1,377