Employee benefits (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| IfrsStatementLineItems [Line Items] | ||
| Current liabilities | $ 886 | $ 1,133 |
| Non-current liabilities | 1,185 | 1,214 |
| Payroll Related Charges And Other Remunerations [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Current liabilities | 812 | 1,014 |
| Share Based Payment [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Current liabilities | 5 | 51 |
| Employee Postretirement Obligation Provision [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Current liabilities | 69 | 68 |
| Non-current liabilities | $ 1,185 | $ 1,214 |