Other assets impairments, restructuring and other items - Summary of Restructuring Accruals (Detail) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Restructuring Reserve [Roll Forward] | ||
| Beginning balance | $ (138) | $ (68) |
| Provision | (121) | (196) |
| Utilization and other | 145 | 96 |
| Ending balance | (114) | (168) |
| Employee termination costs | ||
| Restructuring Reserve [Roll Forward] | ||
| Beginning balance | (124) | (55) |
| Provision | (116) | (191) |
| Utilization and other | 139 | 92 |
| Ending balance | (101) | (154) |
| Other | ||
| Restructuring Reserve [Roll Forward] | ||
| Beginning balance | (14) | (13) |
| Provision | (5) | (5) |
| Utilization and other | 6 | 4 |
| Ending balance | $ (13) | $ (14) |