Accounts receivable, net - Summary of accounts receivable (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 4,873	$ 4,519	$ 4,553
Less: allowance for credit losses	(154)	(140)	(150)
Other current receivables	422	441	395
Total accounts receivable, net	5,141	4,820	4,798
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	4,214	3,829	3,916
Construction contract assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 659	$ 690	$ 637