Accounts receivable, net - Summary of accounts receivable (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 4,821	$ 4,519
Less: allowance for credit losses	(137)	(140)
Other current receivables	494	441
Total accounts receivable, net	5,178	4,820
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	4,296	3,829
Construction contract assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 525	$ 690