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Pensions and similar obligations - Summary of Changes in Unrecognized Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of changes in unrecognized assets of defined benefit plans [abstract]      
Irrecoverable surplus impact at 1 January $ (63) $ (38) $ (43)
Interest expense (7) (4) (4)
Changes excluding amounts included in interest expense (25) (21) 9
Irrecoverable surplus impact at 31 December $ (95) $ (63) $ (38)