Income taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Current tax:
U.S. - Federal	$ 383	$ 466	$ 632
U.S. - State	71	84	67
Non-U.S.	420	355	290
Total current tax expense	874	905	989
Deferred tax:
U.S. - Federal	230	187	(28)
U.S. - State	25	(5)	(12)
Non-U.S.	(88)	(2)	(24)
Total deferred tax expense (benefit)	167	180	(64)
Effective income tax rate	$ 1,041	$ 1,085	$ 925