Risks Arising from Financial Instruments - Summary of Allowance for Impairment (Detail) - Impairment losses [member] - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Disclosure of impairment loss and reversal of impairment loss [line items] | ||
| Beginning balance | $ (468) | $ (438) |
| Impairment losses | (25) | (53) |
| Derecognition | 10 | 64 |
| Currency translation and other | (4) | (40) |
| Ending balance | $ (487) | $ (468) |