Income taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current tax:
U.S. - Federal	$ 632	$ 443	$ 304
U.S. - State	67	87	47
Non-U.S.	290	221	205
Total current tax expense	989	751	556
Deferred tax:
U.S. - Federal	(28)	11	54
U.S. - State	(12)	(6)	11
Non-U.S.	(24)	6	29
Total deferred tax (benefit) expense	(64)	11	94
Total tax expense	$ 925	$ 762	$ 650