Accounts receivable, net - Summary of accounts receivable (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 6,110	$ 4,290	$ 5,771
Less: allowance for credit losses	(151)	(149)	(139)
Other current receivables	463	366	340
Total accounts receivable, net	6,422	4,507	5,972
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	5,106	3,574	4,766
Construction contract assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 1,004	$ 716	$ 1,005