Accounts receivable, net - Summary of accounts receivable (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 4,553	$ 4,290	$ 4,421
Less: allowance for credit losses	(150)	(149)	(134)
Other current receivables	395	366	419
Total accounts receivable, net	4,798	4,507	4,706
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	3,916	3,574	3,799
Construction contract assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 637	$ 716	$ 622