Income taxes - Income before income taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
U.S.	$ 4,438	$ 6,445	$ 9,122
Non-U.S.	1,015	973	910
Income before income taxes	$ 5,453	$ 7,418	$ 10,032