Financial and capital risk management (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| IfrsStatementLineItems [Line Items] | ||
| Assets | $ 572 | $ 414 |
| Liabilities | 142 | 94 |
| Not Designated As Hedging Instruments [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Assets | 1,035 | 617 |
| Liabilities | 320 | 146 |
| Not Designated As Hedging Instruments [Member] | Foreign Exchange And Interest Rate Risk [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Assets | 918 | 588 |
| Liabilities | 181 | 133 |
| Not Designated As Hedging Instruments [Member] | Commodity price risk [member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Assets | 117 | 29 |
| Liabilities | 137 | $ 13 |
| Not Designated As Hedging Instruments [Member] | Embedded Derivatives Risk [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Liabilities | $ 2 |