Financial instruments - Summary of 10% Appreciation Against the Dollar of Main Currencies (Details) - 10% percentage appreciation - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Sterling | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | $ (69) | $ (270) |
| Increase in net assets | 789 | 1,022 |
| Euro | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | 98 | (46) |
| Increase in net assets | 2,410 | 2,434 |
| Malaysian ringgit | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | 34 | 49 |
| Increase in net assets | 274 | 279 |
| Australian dollar | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | (103) | (129) |
| Increase in net assets | 625 | 780 |
| Canadian dollar | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | 20 | 9 |
| Increase in net assets | $ 1,353 | $ 1,392 |