Financial instruments - Summary of 10% Appreciation Against the Dollar of Main Currencies (Details) - 10% percentage appreciation - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Sterling | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | $ (270) | $ (168) |
| Increase in net assets | 1,022 | 894 |
| Euro | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | (46) | 124 |
| Increase in net assets | 2,434 | 1,486 |
| Malaysian ringgit | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | 49 | 65 |
| Increase in net assets | 279 | 313 |
| Australian dollar | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | (129) | (65) |
| Increase in net assets | 780 | 837 |
| Canadian dollar | ||
| Disclosure Of Foreign Exchange Risk [Line Items] | ||
| Increase/(decrease) in income before taxation | 9 | (44) |
| Increase in net assets | $ 1,392 | $ 1,575 |