Income taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current tax:
U.S. - Federal	$ 466	$ 632	$ 443
U.S. - State	84	67	87
Non-U.S.	355	290	221
Total current tax expense	905	989	751
Deferred tax:
U.S. - Federal	187	(28)	11
U.S. - State	(5)	(12)	(6)
Non-U.S.	(2)	(24)	6
Total deferred tax expense (benefit)	180	(64)	11
Total tax expense	$ 1,085	$ 925	$ 762