Supplemental Cash Flow Information - Details of Other in the Consolidated Statement of Cash Flow (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Disclosure Of Other In Consolidated Statement Of Cash Flow [abstract] | ||||
| Non-cash employee benefit charges | $ 49 | $ 44 | $ 102 | $ 85 |
| Net (gains) losses on foreign exchange and derivative financial instruments | (6) | 49 | (14) | 58 |
| Fair value adjustments (see note 5) | 2 | 7 | (1) | 14 |
| Other | (44) | 5 | (40) | 12 |
| Total | $ 1 | $ 105 | $ 47 | $ 169 |