Accounts receivable, net - Summary of accounts receivable (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 4,890	$ 4,821	$ 4,873
Less: allowance for credit losses	(139)	(137)	(154)
Other current receivables	462	494	422
Total accounts receivable, net	5,213	5,178	5,141
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	4,380	4,296	4,214
Construction contract assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 510	$ 525	$ 659