Risks Arising from Financial Instruments - Summary of Foreign Exchange Results Recognized on Unhedged and Hedged Exposures (Detail) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Net foreign exchange results [line items] | |||
| Net foreign exchange | $ (386) | $ (147) | $ (353) |
| Hedged (economic hedges) [Member] | |||
| Net foreign exchange results [line items] | |||
| Net foreign exchange | 93 | (186) | 70 |
| Not hedged [Member] | |||
| Net foreign exchange results [line items] | |||
| Net foreign exchange | $ (479) | $ 40 | $ (423) |