Accounts receivable, net - Movement in credit loss allowance (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
At January 1	$ 140	$ 149
Charge-offs	(2)	(2)
Provision for credit losses	6	4
Foreign currency translation and other	10	(1)
At March 31	$ 154	$ 150