Accounts receivable, net - Movement in credit loss allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
At January 1	$ 149	$ 125	$ 131
Charge-offs	(14)	(18)	(19)
Provision for credit losses	7	39	24
Foreign currency translation and other	(2)	3	(11)
At December 31	$ 140	$ 149	$ 125