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Other assets impairments, restructuring and other items - Summary of Restructuring Accruals (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning balance |  | $ (68) | $ (82)
Provision |  | (196) | (52)
Utilization and other | [1] | 96 | 64
Ending balance |  | (168) | (70)
Employee termination costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning balance |  | (55) | (75)
Provision |  | (191) | (33)
Utilization and other | [1] | 92 | 52
Ending balance |  | (154) | (56)
Other Exit and Disposal [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning balance |  | (13) | (7)
Provision |  | (5) | (19)
Utilization and other | [1] | 4 | 12
Ending balance |  | $ (14) | $ (14)
[1] | Includes adjustments for foreign currency translation.

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