Accounts receivable, net - Movement in credit loss allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
As of January 1	$ 140	$ 149	$ 125
Charge-offs	(14)	(14)	(18)
Provision for credit losses	6	11	47
Recoveries	(12)	(4)	(8)
Foreign currency translation and other	17	(2)	3
As of December 31	$ 137	$ 140	$ 149