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Post-employment benefits for associates - Healthcare cost trend rate assumptions used for other post-employment benefits (Details) - Other post-employment benefit plans
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]      
Healthcare cost trend rate assumed for next year (as a percent) 6.00% 6.30% 6.20%
Rate to which the cost trend rate is assumed to decline (as a percent) 4.50% 4.50% 4.50%