Segment information - Reconciliations of consolidated profit before taxes (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 01, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Sales and revenue by geographic region
Consolidated profit before tax		$ 13,373	$ 13,050	$ 8,752
Cost centers		(1)	(7)	(13)
Corporate costs		(889)	(913)	(751)
Timing		133	(30)	(309)
Restructuring costs		(359)	(780)	(299)
Methodology differences:
Inventory/cost of sales		33	160	413
Postretirement benefit income (expense)		67	(65)	916
Stock-based compensation expense		(223)	(208)	(193)
Financing costs		(126)	(91)	(331)
Currency		145	6	23
Goodwill impairment charge	$ (925)	0	0	(925)
Other income/expense methodology differences		(740)	(624)	(409)
Other methodology differences		(81)	(70)	(102)
Segments Excluding All Other Segments
Sales and revenue by geographic region
Consolidated profit before tax		15,366	15,654	10,743
Other Operating Segment
Sales and revenue by geographic region
Consolidated profit before tax		$ 48	$ 18	$ (11)