Accounts receivable, net - Movement in credit loss allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
At January 1	$ 125	$ 131	$ 140
Charge-offs	(18)	(19)	(14)
Provision for credit losses	39	24	10
Foreign currency translation and other	3	(11)	(5)
At December 31	$ 149	$ 125	$ 131