Income taxes - Components of the provision (benefit) for income taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current tax provision (benefit):
U.S.	$ 1,584	$ 1,627	$ 1,055
Non-U.S.	1,531	1,592	1,255
State (U.S.)	135	154	134
Current tax provision (benefit)	3,250	3,373	2,444
Deferred tax provision (benefit):
U.S.	(553)	(391)	(404)
Non-U.S.	(69)	(164)	50
State (U.S.)	1	(37)	(23)
Deferred tax provision (benefit)	(621)	(592)	(377)
Total provision (benefit) for income taxes	$ 2,629	$ 2,781	$ 2,067