Financial instruments - Summary of 10% Appreciation Against the Dollar of Main Currencies (Details) - 10% percentage appreciation - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Sterling | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | $ (156) | $ (69) |
| Increase in net assets | 547 | 789 |
| Euro | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | (46) | 98 |
| Increase in net assets | 1,896 | 2,410 |
| Malaysian ringgit | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | (49) | 34 |
| Increase in net assets | 271 | 274 |
| Australian dollar | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | (71) | (103) |
| Increase in net assets | 573 | 625 |
| Canadian dollar | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | 153 | 20 |
| Increase in net assets | $ 1,280 | $ 1,353 |