v3.25.2
Auditor's remuneration - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Analysis of income and expense [abstract]      
Remuneration for audit services to retirement benefit plans for employees of subsidiaries $ 1 $ 1 $ 1