Financial instruments - Summary of Net Carrying Amounts of Derivative Contracts Measured Using Predominantly Unobservable Inputs (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items] | ||
| Beginning balance | $ 471 | |
| Ending balance | 2,961 | $ 471 |
| Unobservable inputs | ||
| Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items] | ||
| Beginning balance | 2,037 | 2,466 |
| Net gains recognised in revenue | (163) | (191) |
| Purchases | 195 | 310 |
| Sales | (69) | (363) |
| Recategorisations (net) | 50 | (127) |
| Currency translation differences | 137 | (58) |
| Ending balance | $ 2,187 | $ 2,037 |