Employee benefits (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| IfrsStatementLineItems [Line Items] | ||
| Current liabilities | $ 790 | $ 1,012 |
| Non-current liabilities | 1,170 | 1,118 |
| Payroll Related Charges And Other Remunerations [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Current liabilities | 699 | 934 |
| Charges Related To Share Based Payments [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Current liabilities | 30 | 16 |
| Employee Postretirement Obligation Provision [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Current liabilities | 61 | 62 |
| Non-current liabilities | $ 1,170 | $ 1,118 |